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4<meta http-equiv="content-type" content="text/html; charset=utf-8" />
5<title>Email Self-Defense - a guide to fighting surveillance with GnuPG
6encryption</title>
7<meta name="keywords" content="GnuPG, GPG, openpgp, surveillance, privacy,
77aea16c 8email, security, GnuPG2, encryption" />
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9<meta name="description" content="Email surveillance violates our fundamental
10rights and makes free speech risky. This guide will teach you email
11self-defense in 40 minutes with GnuPG." />
12<meta name="viewport" content="width=device-width, initial-scale=1" />
14c5f099 13<link rel="stylesheet" href="../static/css/main.css" />
19bce4d7 14<link rel="shortcut icon"
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69a73a4e 18
e59c77da 19<!--<div style="text-align: center; padding: 2.5px; background-color: #a94442; color:#fcf8e3;"><p>Due to Enigmail's PGP functionality being migrated into Icedove and Thunderbird, steps 2 and 3 of the guide are currently out of date.</p><p> Thank you for your patience while we're working on a new round of updates.</p></div>-->
0e203e6f 20
f12cd56f 21<!-- PLACE FUNDRAISER MODAL WINDOW HERE -->
aa082aba 22
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23<!-- ~~~~~~~~~ GnuPG Header and introduction text ~~~~~~~~~ -->
24<header class="row" id="header"><div>
116f80c3 25
e59c77da 26
19bce4d7 27<h1>Email Self-Defense</h1>
116f80c3 28
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29<!-- Language list for browsers that do not have JS enabled -->
30<ul id="languages" class="os">
de17dfbe 31<li><a class="current" href="/en">English - v5.0</a></li>
7c252a78 32<li><a href="/es">español - v5.0</a></li>
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33<li><a href="/fr">français - v5.0</a></li>
34<li><a href="/tr">Türkçe - v5.0</a></li>
7c252a78 35<!--<li><a href="/cs">čeština - v4.0</a></li>
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39<li><a href="/it">italiano - v3.0</a></li>
40<li><a href="/ja">日本語 - v4.0</a></li>
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43<li><a href="/ru">русский - v5.0</a></li>
44<!--<li><a href="/sq">Shqip - v4.0</a></li>
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47<li><strong><a href="https://libreplanet.org/wiki/GPG_guide/Translation_Guide">
48Translate!</a></strong></li>
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49</ul>
50
51<ul id="menu" class="os">
37d0bc33 52<li class="spacer"><a href="index.html" class="current">Set up guide</a></li>
53<!--<li><a href="mac.html">Mac OS</a></li>-->
54<!--<li><a href="windows.html">Windows</a></li>-->
f211d856 55<li class="spacer"><a href="workshops.html">Teach your friends</a></li>
cde847ea 56<li class="spacer"><a href="http://hhldo3tnt5solzj2bwfvh7xm4slk2forpjwjyemhcfrlob5gq75gioid.onion/en" target="_blank">This site's tor onion service</a></li>
f211d856 57<li class="spacer"><a
770452f9 58href="https://fsf.org/share?u=https://u.fsf.org/zb&amp;t=Email%20encryption%20for%20everyone%20via%20%40fsf">
f211d856 59Share&nbsp;
14c5f099 60<img src="../static/img/gnu-social.png" class="share-logo"
19bce4d7 61alt="[GNU Social]" />&nbsp;
14c5f099 62<img src="../static/img/mastodon.png" class="share-logo"
d06ce723 63alt="[Mastodon]" />&nbsp;
14c5f099 64<img src="../static/img/reddit-alien.png" class="share-logo"
19bce4d7 65alt="[Reddit]" />&nbsp;
14c5f099 66<img src="../static/img/hacker-news.png" class="share-logo"
f211d856 67alt="[Hacker News]" /></a></li>
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68</ul>
69
70<!-- ~~~~~~~~~ FSF Introduction ~~~~~~~~~ -->
71<div id="fsf-intro">
72
6003a573 73<h3><a href="https://u.fsf.org/ys"><img
19bce4d7 74alt="Free Software Foundation"
14c5f099 75src="../static/img/fsf-logo.png" />
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76</a></h3>
77
78<div class="fsf-emphasis">
79
80<p>We fight for computer users' rights, and promote the development of free (as
81in freedom) software. Resisting bulk surveillance is very important to us.</p>
82
83<p><strong>Please donate to support Email Self-Defense. We need to keep
84improving it, and making more materials, for the benefit of people around
85the world taking the first step towards protecting their privacy.</strong></p>
86
87</div>
88
d1f39676 89<div style="text-align: center;">
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90<p><a href="https://crm.fsf.org/civicrm/contribute/transact?reset=1&amp;id=14&amp;mtm_campaign=email_self_defense&amp;mtm_kwd=guide_donate"><img alt="Donate" src="../static/img/en/donate.png" /></a></p>
91
d1f39676 92<h5>Sign up</h5>
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93<form action="https://my.fsf.org/civicrm/profile/create?reset=1&amp;gid=31" method="post">
94<p>Enter your email address to receive our monthly newsletter, the<br /><a href="https://www.fsf.org/free-software-supporter/">Free Software Supporter</a></p>
d1f39676 95
96<p><input id="frmEmail" type="text" name="email-Primary" size="18" maxlength="80" /></p>
97<p><input type="submit" name="_qf_Edit_next" value="Subscribe me" /></p>
98<div><input name="postURL" type="hidden" value="" />
99<input type="hidden" name="group[25]" value="1" />
9162eaf3 100<input name="cancelURL" type="hidden" value="https://my.fsf.org/civicrm/profile?reset=1&amp;gid=31" />
d1f39676 101<input name="_qf_default" type="hidden" value="Edit:cancel" />
102</div>
103</form></div>
64a48f78 104
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105</div><!-- End #fsf-intro -->
106
107<!-- ~~~~~~~~~ Guide Introduction ~~~~~~~~~ -->
108<div class="intro">
109
110<p><a id="infographic" href="infographic.html"><img
14c5f099 111src="../static/img/en/infographic-button.png"
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112alt="View &amp; share our infographic &rarr;" /></a>
113Bulk surveillance violates our fundamental rights and makes free speech
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114risky. This guide will teach you a basic surveillance self-defense skill: email
115encryption. Once you've finished, you'll be able to send and receive emails
116that are scrambled to make sure a surveillance agent or thief intercepting
117your email can't read them. All you need is a computer with an Internet
118connection, an email account, and about forty minutes.</p>
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119
120<p>Even if you have nothing to hide, using encryption helps protect the privacy
121of people you communicate with, and makes life difficult for bulk surveillance
122systems. If you do have something important to hide, you're in good company;
123these are the same tools that whistleblowers use to protect their identities
80b64e11 124while shining light on human rights abuses, corruption, and other crimes.</p>
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125
126<p>In addition to using encryption, standing up
127to surveillance requires fighting politically for a <a
e59c77da 128href="https://gnu.org/philosophy/surveillance-vs-democracy.html">reduction
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129in the amount of data collected on us</a>, but the essential first step is
130to protect yourself and make surveillance of your communication as difficult
131as possible. This guide helps you do that. It is designed for beginners, but
132if you already know the basics of GnuPG or are an experienced free software
133user, you'll enjoy the advanced tips and the <a href="workshops.html">guide
134to teaching your friends</a>.</p>
135
136</div><!-- End .intro -->
137</div></header><!-- End #header -->
138
139<!-- ~~~~~~~~~ Section 1: Get the pieces ~~~~~~~~~ -->
140<section class="row" id="section1"><div>
141
142<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
143<div class="section-intro">
144
145<h2><em>#1</em> Get the pieces</h2>
146
147<p class="notes">This guide relies on software which is <a
148href="https://www.gnu.org/philosophy/free-sw.html">freely licensed</a>;
149it's completely transparent and anyone can copy it or make their
150own version. This makes it safer from surveillance than proprietary
80b64e11 151software (like Windows or macOS). Learn more about free software at <a
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152href="https://u.fsf.org/ys">fsf.org</a>.</p>
153
c174e65c 154<p>Most GNU/Linux operating systems come with GnuPG installed on them, so if you're running one of these systems, you don't have to download it. If you're running macOS or Windows, steps to download GnuPG are below. Before configuring your encryption setup with this guide, though, you'll need a desktop email program installed on your computer. Many GNU/Linux distributions have one installed already, such as Icedove, which may be under the alternate name "Thunderbird." Programs like these are another way to access the same email accounts you can access in a browser (like Gmail), but provide extra features.</p>
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156</div><!-- End .section-intro -->
157
158<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
159<div id="step-1a" class="step">
160<div class="sidebar">
161
69e314de 162<p class="large"><img
14c5f099 163src="../static/img/en/screenshots/step1a-install-wizard.png"
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164alt="Step 1.A: Install Wizard" /></p>
165
166</div><!-- /.sidebar -->
167<div class="main">
168
169<h3><em>Step 1.a</em> Set up your email program with your email account</h3>
170
171<p>Open your email program and follow the wizard (step-by-step walkthrough)
37d0bc33 172that sets it up with your email account. This usually starts from "Account Settings" &rarr; "Add Mail Account". You should get the email server settings from your systems administrator or the help section of your email account.</p>
77aea16c 173
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174
175<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
176<div class="troubleshooting">
177
178<h4>Troubleshooting</h4>
179
180<dl>
181<dt>The wizard doesn't launch</dt>
182<dd>You can launch the wizard yourself, but the menu option for doing so is
183named differently in each email program. The button to launch it will be in
184the program's main menu, under "New" or something similar, titled something
185like "Add account" or "New/Existing email account."</dd>
186
187<dt>The wizard can't find my account or isn't downloading my mail</dt>
188<dd>Before searching the Web, we recommend you start by asking other people
189who use your email system, to figure out the correct settings.</dd>
190
b7f7b4a2 191<dt>I can't find the menu</dt>
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192<dd>In many new email programs, the main menu is represented by an image of
193three stacked horizontal bars.</dd>
194
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195<dt class="feedback">Don't see a solution to your problem?</dt>
196<dd class="feedback">Please let us know on the <a
197href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
198page</a>.</dd>
199</dl>
200
201</div><!-- /.troubleshooting -->
202</div><!-- End .main -->
203</div><!-- End #step1-a .step -->
204
205<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
206<div id="step-1b" class="step">
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207<div class="main">
208
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209<h3><em>Step 1.b</em> Install GnuPG</h3>
210
211<p>If you are using a GNU/Linux machine, you should already have GnuPG installed, and you can skip to <a href="#section2">Section 2</a>.</p>
19bce4d7 212
63fe86d5 213<p>If you are using a macOS or Windows machine, however, you need to first install the GnuPG program. Select your operating system below and follow the instructions. For the rest of this guide, the steps are the same for all operating systems. </p>
19bce4d7 214
37d0bc33 215<!-- ~~~~~~~~~ MACOS ~~~~~~~~~ -->
216<div class="troubleshooting">
19bce4d7 217
77aea16c 218<h4>macOS</h4>
64af8734 219
37d0bc33 220<dl>
221<dt>Use a third-party package manager to install GnuPG</dt>
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222<dd>
223<p>The default macOS package manager makes it difficult to install GnuPG and other pieces of free software (like Emacs, GIMP, or Inkscape). To make things easier, we recommend setting up the third-party package manager "Homebrew" to install GnuPG. For this, we will use a program called "Terminal," which is pre-installed on macOS.</p>
224
225<p># Copy the first command on the home page of <a href="https://brew.sh/">Homebrew</a> by clicking on the clipboard icon, and paste it in Terminal. Click "Enter" and wait for the installation to finalize.</p>
226<p># Then install GnuPG by entering the following code in Terminal:<br/>
227<code>brew install gnupg gnupg2</code></p>
228</dd>
37d0bc33 229</dl>
230
231</div><!-- /.troubleshooting -->
232
233<!-- ~~~~~~~~~ WINDOWS ~~~~~~~~~ -->
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234<div class="troubleshooting">
235
37d0bc33 236<h4>Windows</h4>
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237
238<dl>
37d0bc33 239<dt>Get GnuPG by downloading GPG4Win</dt>
b4a6695d 240<dd><p><a href="https://www.gpg4win.org/">GPG4Win</a> is an email and file encryption software package that includes GnuPG. Download and install the latest version, choosing default options whenever asked. After it's installed, you can close any windows that it creates.</p>
37d0bc33 241</dd>
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242</dl>
243
244</div><!-- /.troubleshooting -->
245</div><!-- End .main -->
37d0bc33 246</div><!-- End #step1-b .step -->
247
80b64e11 248<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
249<div id="terminology" class="step">
250<div class="main">
251
a4eb3926 252<h3>GnuPG, OpenPGP, what?</h3>
80b64e11 253
254<p>In general, the terms GnuPG, GPG, GNU Privacy Guard, OpenPGP and PGP
255are used interchangeably. Technically, OpenPGP (Pretty Good Privacy) is the
256encryption standard, and GNU Privacy Guard (often shortened to GPG or GnuPG)
257is the program that implements the standard. Most email programs provide an interface for GnuPG. There is also a newer version of GnuPG, called GnuPG2.</p>
258
259</div><!-- End .main -->
260</div><!-- End #terminology.step-->
261
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262</div></section><!-- End #section1 -->
263
264<!-- ~~~~~~~~~ Section 2: Make your keys ~~~~~~~~~ -->
7b83f7f9 265<section id="section2" class="row"><div>
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266
267<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
268<div class="section-intro">
269
270<h2><em>#2</em> Make your keys</h2>
69e314de 271<p class="float medium"><img src="../static/img/en/screenshots/step2a-01-make-keypair.png" alt="A robot with a head shaped like a key holding a private and a public key"/></p>
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272
273<p>To use the GnuPG system, you'll need a public key and a private key (known
274together as a keypair). Each is a long string of randomly generated numbers
275and letters that are unique to you. Your public and private keys are linked
276together by a special mathematical function.</p>
277
278<p>Your public key isn't like a physical key, because it's stored in the open
279in an online directory called a keyserver. People download it and use it,
280along with GnuPG, to encrypt emails they send to you. You can think of the
281keyserver as a phonebook; people who want to send you encrypted email can
282look up your public key.</p>
283
284<p>Your private key is more like a physical key, because you keep it to
285yourself (on your computer). You use GnuPG and your private key together to
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286descramble encrypted emails other people send to you. <strong>You should never share your private key with anyone, under any
287circumstances.</strong></p>
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288
289<p>In addition to encryption and decryption, you can also use these keys to
290sign messages and check the authenticity of other people's signatures. We'll
291discuss this more in the next section.</p>
292
293</div><!-- End .section-intro -->
294
295<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
296<div id="step-2a" class="step">
297<div class="sidebar">
69e314de 298<p class="large"><img
14c5f099 299src="../static/img/en/screenshots/step2a-02-make-keypair.png"
35f08087 300alt="Step 2.A: Make your Keypair" /></p>
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301
302<p class="large"><img
14c5f099 303src="../static/img/en/screenshots/step2a-03-make-keypair.png"
7b83f7f9 304alt="Step 2.A: Set your passphrase" /></p>
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305
306</div><!-- /.sidebar -->
307<div class="main">
308
309<h3><em>Step 2.a</em> Make a keypair</h3>
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310
311<h4>Make your keypair</h4>
19bce4d7 312
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313<p>We will use the command line in a terminal to create a keypair using the
314GnuPG program.</p>
19bce4d7 315
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316<p class="notes">Whether on GNU/Linux, macOS or Windows, you can launch your
317terminal ("Terminal" in macOS, "PowerShell" in Windows) from the Applications
318menu (some GNU/Linux systems respond to the <kbd>Ctrl + Alt + T</kbd>
319shortcut).</p>
320
321<p># Enter <code>gpg --full-generate-key</code> to start the process.</p>
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322<p># To answer what kind of key you would like to create, select the default option: <samp>1&nbsp;RSA&nbsp;and&nbsp;RSA</samp>.</p>
323<p># Enter the following keysize: <code>4096</code> for a strong key.</p>
63fe86d5 324<p># Choose the expiration date; we suggest <code>2y</code> (2 years).</p>
e59c77da 325<p>Follow the prompts to continue setting up with your personal details.</p>
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326<p class="notes"> Depending on your version of GPG, you may need to use
327<code>--gen-key</code> instead of code>--full-generate-key</code>&#65279;.</p>
19bce4d7 328
77aea16c 329<h4>Set your passphrase</h4>
7b83f7f9 330<p>On the screen titled "Passphrase," pick a strong password! You can
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331do it manually, or you can use the Diceware method. Doing it manually
332is faster but not as secure. Using Diceware takes longer and requires
4d10d72d 333dice, but creates a password that is much harder for attackers to figure
19bce4d7 334out. To use it, read the section "Make a secure passphrase with Diceware" in <a
f211d856 335href="https://theintercept.com/2015/03/26/passphrases-can-memorize-attackers-cant-guess/">
7b83f7f9 336this article</a> by Micah Lee.</p>
337
19bce4d7 338
7b83f7f9 339<p>If you'd like to pick a passphrase manually, come up with something
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340you can remember which is at least twelve characters long, and includes
341at least one lower case and upper case letter and at least one number or
342punctuation symbol. Never pick a password you've used elsewhere. Don't use
343any recognizable patterns, such as birthdays, telephone numbers, pets' names,
344song lyrics, quotes from books, and so on.</p>
345
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346<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
347<div class="troubleshooting">
348
349<h4>Troubleshooting</h4>
19bce4d7 350<dl>
e59c77da 351<dt>GnuPG is not installed</dt>
7b83f7f9 352<dd>
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353You can check if this is the case with the command <code>gpg --version</code>&#65279;.
354If GnuPG is not installed, it will bring up the following result on most GNU/Linux operating systems, or something like it:
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355<samp>Command 'gpg' not found, but can be installed with:
356 sudo apt install gnupg</samp>. Follow that command and install the program.</dd>
7b83f7f9 357
061aad83 358<dt><i>gpg --full-generate-key</i> command not working</dt>
412a3134 359<dd>Some distributions use a different version of GPG. When you receive an error code that is something along the lines of: <samp>gpg: Invalid option "--full-generate-key"</samp>, you can try the following commands: <br />
061aad83 360<code>sudo apt update</code><br />
361<code>sudo apt install gnupg2</code><br />
362<code>gpg2 --full-generate-key</code><br />
a7ba22c6 363If this resolved the issue, you need to continue to use the gpg2 identifier instead of gpg throughout the following steps of the guide.
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364<p class="notes"> Depending on your version of GPG, you may need to use
365<code>--gen-key</code> instead of code>--full-generate-key</code>&#65279;.</p>
366</dd>
061aad83 367
7b83f7f9 368<dt>I took too long to create my passphrase</dt>
b7f7b4a2 369<dd>That's okay. It's important to think about your passphrase. When you're ready, just follow the steps from the beginning again to create your key.</dd>
19bce4d7 370
b7f7b4a2 371<dt>How can I see my key?</dt>
7b83f7f9 372<dd>
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373Use the following command to see all keys: <code>gpg --list-keys</code>&#65279;. Yours should be listed in there, and later, so will Edward's (<a href="#section3">Section 3</a>).<br />
374If you want to see only your key, you can use <code>gpg --list-key [your@email]</code>&#65279;.<br />
77aea16c 375You can also use <code>gpg --list-secret-key</code> to see your own private key.</dd>
19bce4d7 376
19bce4d7 377<dt>More resources</dt>
7b83f7f9 378<dd>For more information about this process, you can also refer to <a
379href="https://www.gnupg.org/gph/en/manual/c14.html#AEN25">The GNU Privacy
380Handbook</a>. Make sure you stick with "RSA and RSA" (the default),
381because it's newer and more secure than the algorithms the documentation
63fe86d5 382recommends. Also make sure your key is at least 4096&nbsp;bits if you
80b64e11 383want to be secure.</dd>
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384
385<dt class="feedback">Don't see a solution to your problem?</dt>
386<dd class="feedback">Please let us know on the <a
387href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
388page</a>.</dd>
389</dl>
390
391</div><!-- /.troubleshooting -->
392
393<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
394<div class="troubleshooting">
395
396<h4>Advanced</h4>
19bce4d7 397<dl>
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398<dt>Advanced key pairs</dt>
399<dd>When GnuPG creates a new keypair, it compartmentalizes
400the encryption function from the signing function through <a
401href="https://wiki.debian.org/Subkeys">subkeys</a>. If you use
7b83f7f9 402subkeys carefully, you can keep your GnuPG identity more
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403secure and recover from a compromised key much more quickly. <a
404href="https://alexcabal.com/creating-the-perfect-gpg-keypair/">Alex Cabal</a>
6003a573 405and <a href="https://keyring.debian.org/creating-key.html">the Debian wiki</a>
19bce4d7 406provide good guides for setting up a secure subkey configuration.</dd>
64f8f564 407</dl>
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408
409</div><!-- /.troubleshooting -->
410</div><!-- End .main -->
411</div><!-- End #step-2a .step -->
412
413<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
414<div id="step-2b" class="step">
7b83f7f9 415<div class="sidebar">
69e314de 416<p class="large"><img
14c5f099 417src="../static/img/en/screenshots/step2b-04-upload-and-certificate.png"
80b64e11 418alt="Step 2.B: Send to server and generate a certificate" /></p>
19bce4d7 419
7b83f7f9 420</div><!-- /.sidebar -->
421<div class="main">
19bce4d7 422
7b83f7f9 423<h3><em>Step 2.b</em> Some important steps following creation</h3>
19bce4d7 424
77aea16c 425<h4>Upload your key to a keyserver</h4>
7b83f7f9 426<p>We will upload your key to a keyserver, so if someone wants to send you an encrypted message, they can download your public key from the Internet. There are multiple keyservers
9c973564 427that you can select from the menu when you upload, but they are mostly all copies
428of each other. Any server will work, but it's good to remember which one you uploaded your key to originally. Also keep in mind, sometimes takes a few hours for them to match each other when a new key is uploaded.</p>
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429<p># Copy your keyID: <code>gpg --list-key [your@email]</code> will list your public ("pub") key information, including your keyID, which is a unique list of numbers and letters. Copy this keyID, so you can use it in the following command.</p>
430<p># Upload your key to a server:
431<code>gpg --send-key [keyID]</code></p>
7b83f7f9 432
77aea16c 433<h4>Export your key to a file</h4>
4f41943f 434<p>Use the following command to export your secret key so you can import it into your email client at the next <a href="#section3">step</a>. To avoid getting your key compromised, store this in a safe place, and make sure that if it is transferred, it is done so in a trusted way. Exporting your keys can be done with the following commands:</p>
77aea16c 435<p><code>
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436$ gpg --export-secret-keys -a [keyID] > my_secret_key.asc<br/>
437$ gpg --export -a [keyID] > my_public_key.asc
77aea16c 438</code></p>
7b83f7f9 439
77aea16c 440<h4>Generate a revocation certificate</h4>
63fe86d5 441<p>Just in case you lose your key, or it gets compromised, you want to generate a certificate and choose to save it in a safe place on your computer for now (please refer to <a href="#step-6c">Step 6.C</a> for how to best store your revocation cerficate safely). This step is essential for your email self-defense, as you'll learn more about in <a href="#section5">Section 5</a>.</p>
b7f7b4a2 442
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443<p># Copy your keyID: <code>gpg --list-key [your@email]</code> will list your public ("pub") key information, including your keyID, which is a unique list of numbers and letters. Copy this keyID, so you can use it in the following command.</p>
444<p># Generate a revocation certificate: <code>gpg --gen-revoke --output revoke.asc [keyID]</code></p>
445<p># It will prompt you to give a reason for revocation, we recommend to use <samp>1&nbsp;=&nbsp;key has been compromised</samp>.</p>
63fe86d5 446<p># You don't have to fill in a reason, but you can; then press "Enter" for an empty line, and confirm your selection.</p>
80b64e11 447
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448
449<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
450<div class="troubleshooting">
451
452<h4>Troubleshooting</h4>
453
454<dl>
563fcf5d 455<dt>Sending my key to the keyserver is not working</dt>
412a3134 456<dd>Instead of using the general command to upload your key to the keyserver, you can use a more specific command and add the keyserver to your command <code>gpg --keyserver keys.openpgp.org --send-key [keyID]</code>&#65279;.</dd>
563fcf5d 457
b7f7b4a2 458<dt>My key doesn't seem to be working or I get a "permission denied."</dt>
e4fa2e82 459<dd><p>Like every other file or folder, gpg keys are subject to permissions. If these are not set correctly, your system may not be accepting your keys. You can follow the next steps to check, and update to the right permissions.</p>
19bce4d7 460
77aea16c 461<p># Check your permissions: <code>ls -l ~/.gnupg/*</code></p>
e4fa2e82 462<p># Set permissions to read, write, execute for only yourself, no others. These are the recommended permissions for your folder. <br/>
77aea16c 463You can use the code: <code>chmod 700 ~/.gnupg</code></p>
e4fa2e82 464<p># Set permissions to read and write for yourself only, no others. These are the recommended permissions for the keys inside your folder. <br/>
77aea16c 465You can use the code: <code>chmod 600 ~/.gnupg/*</code></p>
19bce4d7 466
e4fa2e82 467<p class="notes">If you have (for any reason) created your own folders inside ~/.gnupg, you must also additionally apply execute permissions to that folder. Folders require execution privileges to be opened. For more information on permissions, you can check out <a href="https://helpdeskgeek.com/linux-tips/understanding-linux-permissions-chmod-usage/">this detailed information guide</a>.</p>
7b83f7f9 468</dd>
412a3134 469
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470<dt class="feedback">Don't see a solution to your problem?</dt>
471<dd class="feedback">Please let us know on the <a
472href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
473page</a>.</dd>
474</dl>
475
476</div><!-- /.troubleshooting -->
477
478<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
479<div class="troubleshooting">
480
481<h4>Advanced</h4>
482
483<dl>
7b83f7f9 484<dt>More about keyservers</dt>
485<dd>You can find some more keyserver information<a
803e8e2e 486href="https://www.gnupg.org/gph/en/manual/x457.html"> in this manual</a>. <a
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487href="https://sks-keyservers.net/overview-of-pools.php">The sks Web site</a>
488maintains a list of highly interconnected keyservers. You can also <a
489href="https://www.gnupg.org/gph/en/manual/x56.html#AEN64">directly export
490your key</a> as a file on your computer.</dd>
7b83f7f9 491
492<dt>Transferring your keys</dt>
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493<dd>
494<p>Use the following commands to transfer your keys. To avoid getting your key compromised, store it in a safe place, and make sure that if it is transferred, it is done so in a trusted way. Importing and exporting a key can be done with the following commands:</p>
7b83f7f9 495
77aea16c 496<p><code>
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497$ gpg --export-secret-keys -a [keyID] > my_private_key.asc<br />
498$ gpg --export -a [keyID] > my_public_key.asc<br />
499$ gpg --import my_private_key.asc<br />
e4fa2e82 500$ gpg --import my_public_key.asc
77aea16c 501</code></p>
7b83f7f9 502
35f08087 503<p>Ensure that the keyID printed is the correct one, and if so, then go ahead and add ultimate trust for it:</p>
e4fa2e82 504
77aea16c 505<p><code>
35f08087 506$ gpg --edit-key [your@email]
77aea16c 507</code></p>
7b83f7f9 508
dbfeba09 509<p>Because this is your key, you should choose <code>ultimate</code>&#65279;. You shouldn't trust anyone else's key ultimately.</p>
80b64e11 510
63fe86d5 511<p class="notes"> Refer to <a href="#step-2b">Troubleshooting in Step 2.B</a> for more information on permissions. When transferring keys, your permissions may get mixed, and errors may be prompted. These are easily avoided when your folders and files have the right permissions</p>
7b83f7f9 512</dd>
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513</dl>
514
515</div><!-- /.troubleshooting -->
516</div><!-- End .main -->
517</div><!-- End #step-2b .step -->
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518</div></section><!-- End #section2 -->
519
7b83f7f9 520<!-- ~~~~~~~~~ Section 3: Set up email encryption ~~~~~~~~~ -->
521<section id="section3" class="row"><div>
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522
523<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
524<div class="section-intro">
525
7b83f7f9 526<h2><em>#3</em> Set up email encryption</h2>
64f8f564 527<p class="notes">The Icedove (or Thunderbird) email program has PGP functionality integrated, which makes it pretty easy to work with. We'll take you through the steps of integrating and using your key in these email clients.</p>
7b83f7f9 528
529</div><!-- End .section-intro -->
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530
531<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 532<div id="step-3a" class="step">
533<div class="sidebar">
534
69e314de 535<p class="large"><img src="../static/img/en/screenshots/step3a-open-key-manager.png"
fedfd572 536alt="Step 3.A: Email Menu" /></p>
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537
538<p class="large"><img src="../static/img/en/screenshots/step3a-import-from-file.png"
7b83f7f9 539alt="Step 3.A: Import From File" /></p>
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540
541<p class="large"><img src="../static/img/en/screenshots/step3a-success.png"
7b83f7f9 542alt="Step 3.A: Success" /></p>
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543
544<p class="large"><img src="../static/img/en/screenshots/step3a-troubleshoot.png"
40833450 545alt="Step 3.A: Troubleshoot" /></p>
7b83f7f9 546</div><!-- /.sidebar -->
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547<div class="main">
548
7b83f7f9 549<h3><em>Step 3.a</em> Set up your email with encryption</h3>
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550
551<p>Once you have set up your email with encryption, you can start contributing to encrypted traffic on the Internet. First we'll get your email client to import your secret key, and we will also learn how to get other people's public keys from servers so you can send and receive encrypted email.</p>
19bce4d7 552
fb4dff9b 553<p># Open your email client and use "Tools" &rarr; <i>OpenPGP Key Manager</i></p>
77aea16c 554<p># Under "File" &rarr; <i>Import Secret Key(s) From File</i></p>
63fe86d5 555<p># Select the file you saved under the name [my_secret_key.asc] in <a href="#step-2b">Step 2.B</a> when you exported your key</p>
7b83f7f9 556<p># Unlock with your passphrase</p>
557<p># You will receive a "OpenPGP keys successfully imported" window to confirm success</p>
fb4dff9b 558<p># Go to "Account settings" &rarr; "End-To-End Encryption," and make sure your key is imported and select <i>Treat this key as a Personal Key</i>.</p>
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559
560</div><!-- End .main -->
19bce4d7 561
7b83f7f9 562<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
7b83f7f9 563<div class="main">
564<div class="troubleshooting">
565<h4>Troubleshooting</h4>
566<dl>
567<dt>I'm not sure the import worked correctly</dt>
568<dd>
fb4dff9b 569Look for "Account settings" &rarr; "End-To-End Encryption." Here you can see if your personal key associated with this email is found. If it is not, you can try again via the <i>Add key</i> option. Make sure you have the correct, active, secret key file.
7b83f7f9 570</dd>
571
572<dt class="feedback">Don't see a solution to your problem?</dt>
573<dd class="feedback">Please let us know on the <a
574href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
575page</a>.</dd>
576</dl>
577
578</div><!-- /.troubleshooting -->
579</div><!-- End .main -->
580</div><!-- End #step3-a .step -->
581</div></section><!-- End #section3 -->
582
583<!-- ~~~~~~~~~ Section 4: Try it out ~~~~~~~~~ -->
584<section class="row" id="section4"><div>
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585
586<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
587<div class="section-intro">
588
7b83f7f9 589<h2><em>#4</em> Try it out!</h2>
69e314de 590<p class="float small"><img src="../static/img/en/screenshots/section3-try-it-out.png" alt="Illustration of a person in a house with a cat connected to a server"/></p>
a4eb3926 591<p>Now you'll try a test correspondence with an FSF computer program named Edward,
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592who knows how to use encryption. Except where noted, these are the same
593steps you'd follow when corresponding with a real, live person.</p>
594
595<!-- <p>NOTE: Edward is currently having some technical difficulties, so he
596may take a long time to respond, or not respond at all. We're sorry about
597this and we're working hard to fix it. Your key will still work even without
598testing with Edward.</p> -->
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599
600<div style="clear: both"></div>
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601</div><!-- End .section-intro -->
602
603<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 604<div id="step-4a" class="step">
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605<div class="sidebar">
606
69e314de 607<p class="large"><img
14c5f099 608src="../static/img/en/screenshots/step4a-send-key-to-Edward.png"
7b83f7f9 609alt="Step 4.A Send key to Edward." /></p>
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610
611</div><!-- /.sidebar -->
612<div class="main">
613
7b83f7f9 614<h3><em>Step 4.a</em> Send Edward your public key</h3>
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615
616<p>This is a special step that you won't have to do when corresponding
7b83f7f9 617with real people. In your email program's menu, go to "Tools" &rarr; "OpenPGP Key
a4eb3926 618Manager." You should see your key in the list that pops up. Right click
77aea16c 619on your key and select <i>Send Public Keys by Email</i>. This will create a new draft message, as if you had just hit the "Write" button, but in the attachment you will find your public keyfile.</p>
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620
621<p>Address the message to <a
622href="mailto:edward-en@fsf.org">edward-en@fsf.org</a>. Put at least one word
623(whatever you want) in the subject and body of the email. Don't send yet.</p>
624
77aea16c 625<p>We want Edward to be able to open the email with your keyfile, so we want this first special message to be unencrypted. Make sure encryption is turned off by using the dropdown menu "Security" and select <i>Do Not Encrypt</i>. Once encryption is off, hit Send.</p>
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626
627<p class="notes">It may take two or three minutes for Edward to
628respond. In the meantime, you might want to skip ahead and check out the <a
b7f7b4a2 629href="#section6">Use it Well</a> section of this guide. Once you have received a response,
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630head to the next step. From here on, you'll be doing just the same thing as
631when corresponding with a real person.</p>
632
7b83f7f9 633<p>When you open Edward's reply, GnuPG may prompt you for your passphrase
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634before using your private key to decrypt it.</p>
635
636</div><!-- End .main -->
7b83f7f9 637</div><!-- End #step-4a .step -->
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638
639<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 640<div id="step-4b" class="step">
641<div class="sidebar">
19bce4d7 642
69e314de 643<p class="large"><img
14c5f099 644src="../static/img/en/screenshots/step4b-option1-verify-key.png"
7b83f7f9 645alt="Step 4.B Option 1. Verify key" /></p>
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646
647<p class="large"><img
14c5f099 648src="../static/img/en/screenshots/step4b-option2-import-key.png"
7b83f7f9 649alt="Step 4.B Option 2. Import key" /></p>
650</div><!-- /.sidebar -->
19bce4d7 651
7b83f7f9 652<div class="main">
19bce4d7 653
7b83f7f9 654<h3><em>Step 4.b</em> Send a test encrypted email</h3>
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655
656<h4>Get Edward's key</h4>
657
80b64e11 658<p>To encrypt an email to Edward, you need its public key, so now you'll have
7b83f7f9 659to download it from a keyserver. You can do this in two different ways:</p>
fb4dff9b 660<p><strong>Option 1.</strong> In the email answer you received from Edward as a response to your first email, Edward's public key was included. On the right of the email, just above the writing area, you will find an "OpenPGP" button that has a lock and a little wheel next to it. Click that, and select <i>Discover</i> next to the text: "This message was signed with a key that you don't yet have." A popup with Edward's key details will follow.</p>
19bce4d7 661
fb4dff9b 662<p><strong>Option 2.</strong> Open your OpenPGP Key manager, and under "Keyserver" choose <i>Discover Keys Online</i>. Here, fill in Edward's email address, and import Edward's key.</p>
19bce4d7 663
77aea16c 664<p>The option <i>Accepted (unverified)</i> will add this key to your key manager, and now it can be used to send encrypted emails and to verify digital signatures from Edward.</p>
19bce4d7 665
b7f7b4a2 666<p class="notes">In the popup window confirming if you want to import Edward's key, you'll see many different emails that are all associated with its key. This is correct; you can safely import the key.</p>
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667
668<p class="notes">Since you encrypted this email with Edward's public key,
669Edward's private key is required to decrypt it. Edward is the only one with
80b64e11 670its private key, so no one except Edward can decrypt it.</p>
19bce4d7 671
77aea16c 672<h4>Send Edward an encrypted email</h4>
7b83f7f9 673
a4eb3926 674<p> Write a new email in your email program, addressed to <a
7b83f7f9 675href="mailto:edward-en@fsf.org">edward-en@fsf.org</a>. Make the subject
676"Encryption test" or something similar and write something in the body.</p>
677
77aea16c 678<p>This time, make sure encryption is turned on by using the dropdown menu "Security" and select <i>Require Encryption</i>. Once encryption is on, hit Send.</p>
7b83f7f9 679
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680
681<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
682<div class="troubleshooting">
683
684<h4>Troubleshooting</h4>
685
686<dl>
7b83f7f9 687<dt>"Recipients not valid, not trusted or not found"</dt>
412a3134 688<dd>You could get the above error message, or something along these lines: "Unable to send this message with end-to-end encryption, because there are problems with the keys of the following recipients: ..." In these cases, you may be trying to send an encrypted email to someone when you do not have their public key yet. Make sure you follow the steps above to import the key to your key manager. Open the OpenPGP Key Manager to make sure the recipient is listed there.</dd>
7b83f7f9 689
690<dt>Unable to send message</dt>
77aea16c 691<dd>You could get the following message when trying to send your encrypted email: "Unable to send this message with end-to-end encryption, because there are problems with the keys of the following recipients: edward-en@fsf.org." This usually means you imported the key with the "unaccepted (unverified) option." Go to the "key properties" of this key by right clicking on the key in the OpenPGP Key Manager, and select the option <i>Yes, but I have not verified that this is the correct key</i> in the "Acceptance" option at the bottom of this window. Resend the email.</dd>
7b83f7f9 692
693<dt>I can't find Edward's key</dt>
19bce4d7 694<dd>Close the pop-ups that have appeared since you clicked Send. Make sure
412a3134 695you are connected to the Internet and try again. If that doesn't work, you can download the key manually from <a href="https://keys.openpgp.org/search?q=edward-en%40fsf.org">the keyserver</a>, and import it by using the <i>Import Public Key(s) from File</i> option in the OpenPGP Key Manager.</dd>
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696
697<dt>Unscrambled messages in the Sent folder</dt>
698<dd>Even though you can't decrypt messages encrypted to someone else's key,
699your email program will automatically save a copy encrypted to your public key,
700which you'll be able to view from the Sent folder like a normal email. This
701is normal, and it doesn't mean that your email was not sent encrypted.</dd>
702
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703<dt class="feedback">Don't see a solution to your problem?</dt>
704<dd class="feedback">Please let us know on the <a
705href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
706page</a>.</dd>
707</dl>
708
709</div><!-- /.troubleshooting -->
710
711<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
712<div class="troubleshooting">
713
714<h4>Advanced</h4>
715
716<dl>
717<dt>Encrypt messages from the command line</dt>
718<dd>You can also encrypt and decrypt messages and files from the <a
719href="https://www.gnupg.org/gph/en/manual/x110.html">command line</a>,
720if that's your preference. The option --armor makes the encrypted output
721appear in the regular character set.</dd>
722</dl>
723
724</div><!-- /.troubleshooting -->
725</div><!-- End .main -->
7b83f7f9 726</div><!-- End #step-4b .step -->
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727
728<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
729<div id="step-headers_unencrypted" class="step">
730<div class="main">
731
732<h3><em>Important:</em> Security tips</h3>
19e80165 733
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734<p>Even if you encrypt your email, the subject line is not encrypted, so
735don't put private information there. The sending and receiving addresses
736aren't encrypted either, so a surveillance system can still figure out who
737you're communicating with. Also, surveillance agents will know that you're
738using GnuPG, even if they can't figure out what you're saying. When you
7b83f7f9 739send attachments, you can choose to encrypt them or not,
19bce4d7 740independent of the actual email.</p>
bdf319c4 741
e72398d7
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742<p>For greater security against potential attacks, you can turn off
743HTML. Instead, you can render the message body as plain text. In order
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744to do this in Icedove or Thunderbird, go to "View" &rarr; "Message Body As" &rarr; <i>Plain
745Text</i>.</p>
e72398d7 746
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747</div><!-- End .main -->
748</div><!-- End #step-headers_unencrypted .step-->
d85363e7 749
19bce4d7 750<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 751<div id="step-4c" class="step">
752<div class="sidebar">
753
69e314de 754<p class="large"><img
14c5f099 755src="../static/img/en/screenshots/step4c-Edward-response.png"
7b83f7f9 756alt="Step 4.C Edward's response" /></p>
757
758</div><!-- /.sidebar -->
759
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760<div class="main">
761
7b83f7f9 762<h3><em>Step 4.c</em> Receive a response</h3>
19bce4d7 763
80b64e11 764<p>When Edward receives your email, it will use its private key to decrypt
f54f2134 765it, then reply to you. </p>
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766
767<p class="notes">It may take two or three minutes for Edward to
768respond. In the meantime, you might want to skip ahead and check out the <a
7b83f7f9 769href="#section6">Use it Well</a> section of this guide.</p>
770
169c7097 771<p>Edward will send you an encrypted email back saying your email was received and decrypted. Your email client will automatically decrypt Edward's message.</p>
7b83f7f9 772
f2545138 773<p class="notes">The OpenPGP button in the email will show a little green checkmark over the lock symbol to show the message is encrypted, and a little orange warning sign which means that you have accepted the key, but not verified it. When you have not yet accepted the key, you will see a little question mark there. Clicking the prompts in this button will lead you to key properties as well.</p>
19bce4d7 774
19bce4d7 775</div><!-- End .main -->
7b83f7f9 776</div><!-- End #step-4c .step -->
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777
778<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 779<div id="step-4d" class="step">
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780<div class="main">
781
80b64e11 782<h3><em>Step 4.d</em> Send a signed test email</h3>
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783
784<p>GnuPG includes a way for you to sign messages and files, verifying that
785they came from you and that they weren't tampered with along the way. These
786signatures are stronger than their pen-and-paper cousins -- they're impossible
787to forge, because they're impossible to create without your private key
788(another reason to keep your private key safe).</p>
789
790<p>You can sign messages to anyone, so it's a great way to make people
791aware that you use GnuPG and that they can communicate with you securely. If
792they don't have GnuPG, they will be able to read your message and see your
793signature. If they do have GnuPG, they'll also be able to verify that your
794signature is authentic.</p>
795
a4eb3926 796<p>To sign an email to Edward, compose any message to the email address and click the
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797pencil icon next to the lock icon so that it turns gold. If you sign a
798message, GnuPG may ask you for your password before it sends the message,
799because it needs to unlock your private key for signing.</p>
800
77aea16c 801<p>In "Account Settings" &rarr; "End-To-End-Encryption" you can opt to <i>add digital signature by default</i>.</p>
19bce4d7 802
7b83f7f9 803</div><!-- End .main -->
804</div><!-- End #step-4d .step -->
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805
806<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 807<div id="step-4e" class="step">
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808<div class="main">
809
7b83f7f9 810<h3><em>Step 4.e</em> Receive a response</h3>
19bce4d7 811
f54f2134
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812<p>When Edward receives your email, he will use your public key (which
813you sent him in <a href="#step-3a">Step 3.A</a>) to verify the message
80b64e11 814you sent has not been tampered with and to encrypt a reply to you.</p>
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815
816<p class="notes">It may take two or three minutes for Edward to
817respond. In the meantime, you might want to skip ahead and check out the <a
7b83f7f9 818href="#section6">Use it Well</a> section of this guide.</p>
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819
820<p>Edward's reply will arrive encrypted, because he prefers to use encryption
821whenever possible. If everything goes according to plan, it should say
822"Your signature was verified." If your test signed email was also encrypted,
823he will mention that first.</p>
824
7b83f7f9 825<p>When you receive Edward's email and open it, your email client will
f54f2134
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826automatically detect that it is encrypted with your public key, and
827then it will use your private key to decrypt it.</p>
828
19bce4d7 829</div><!-- End .main -->
7b83f7f9 830</div><!-- End #step-4e .step -->
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831</div></section>
832
803e8e2e 833<!-- ~~~~~~~~~ Section 5: Learn About the Web of Trust ~~~~~~~~~ -->
7b83f7f9 834<section class="row" id="section5"><div>
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835
836<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
837<div class="section-intro">
838
b7f7b4a2 839<h2><em>#5</em> Learn about the Web of Trust</h2>
69e314de 840<p class="float small"><img src="../static/img/en/screenshots/section5-web-of-trust.png" alt="Illustration of keys all interconnected with a web of lines"/></p>
19bce4d7 841
b7f7b4a2 842<p>Email encryption is a powerful technology, but it has a weakness:
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843it requires a way to verify that a person's public key is actually
844theirs. Otherwise, there would be no way to stop an attacker from making
b7f7b4a2 845an email address with your friend's name, creating keys to go with it, and
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846impersonating your friend. That's why the free software programmers that
847developed email encryption created keysigning and the Web of Trust.</p>
848
849<p>When you sign someone's key, you are publicly saying that you've verified
850that it belongs to them and not someone else.</p>
851
852<p>Signing keys and signing messages use the same type of mathematical
853operation, but they carry very different implications. It's a good practice
854to generally sign your email, but if you casually sign people's keys, you
77aea16c 855may accidentally end up vouching for the identity of an imposter.</p>
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856
857<p>People who use your public key can see who has signed it. Once you've
858used GnuPG for a long time, your key may have hundreds of signatures. You
859can consider a key to be more trustworthy if it has many signatures from
860people that you trust. The Web of Trust is a constellation of GnuPG users,
861connected to each other by chains of trust expressed through signatures.</p>
862
863</div><!-- End .section-intro -->
864
865<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 866<div id="step-5a" class="step">
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867<div class="sidebar">
868
69e314de 869<p class="large"><img
14c5f099 870src="../static/img/en/screenshots/step5a-key-properties.png"
7b83f7f9 871alt="Section 5: trusting a key" /></p>
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872
873</div><!-- /.sidebar -->
874<div class="main">
875
7b83f7f9 876<h3><em>Step 5.a</em> Sign a key</h3>
19bce4d7 877
77aea16c 878<p>In your email program's menu, go to OpenPGP Key Manager and select <i>Key properties</i> by right clicking on Edward's key.</p>
19bce4d7 879
77aea16c 880<p>Under "Your Acceptance," you can select <i>Yes, I've verified in person this key has the correct fingerprint"</i>.</p>
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881
882<p class="notes">You've just effectively said "I trust that Edward's public
883key actually belongs to Edward." This doesn't mean much because Edward isn't
b7f7b4a2 884a real person, but it's good practice, and for real people it is important. You can read more about signing a person's key in the <a href="#check-ids-before-signing">check IDs before signing</a> section.</p>
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885
886<!--<div id="pgp-pathfinder">
887
888<form enctype="application/x-www-form-urlencoded" action="/mk_path.cgi"
889method="get">
890
f211d856 891<p><strong>From:</strong><input type="text" value="xD41A008"
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892name="FROM"></p>
893
f211d856 894<p><strong>To:</strong><input type="text" value="50BD01x4" name="TO"></p>
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895
896<p class="buttons"><input type="submit" value="trust paths" name="PATHS"><input
897type="reset" value="reset" name=".reset"></p>
898
899</form>
900
901</div>End #pgp-pathfinder -->
902</div><!-- End .main -->
7b83f7f9 903</div><!-- End #step-5a .step -->
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904
905<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
906<div id="step-identify_keys" class="step">
907<div class="main">
908
909<h3>Identifying keys: Fingerprints and IDs</h3>
910
911<p>People's public keys are usually identified by their key fingerprint,
912which is a string of digits like F357AA1A5B1FA42CFD9FE52A9FF2194CC09A61E8
913(for Edward's key). You can see the fingerprint for your public key, and
7b83f7f9 914other public keys saved on your computer, by going to OpenPGP Key
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915Management in your email program's menu, then right clicking on the key
916and choosing Key Properties. It's good practice to share your fingerprint
917wherever you share your email address, so that people can double-check that
918they have the correct public key when they download yours from a keyserver.</p>
919
c0c01f86 920<p class="notes">You may also see public keys referred to by a shorter
a4eb3926 921keyID. This keyID is visible directly from the Key Management
922window. These eight character keyIDs were previously used for
c0c01f86
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923identification, which used to be safe, but is no longer reliable. You
924need to check the full fingerprint as part of verifying you have the
925correct key for the person you are trying to contact. Spoofing, in
926which someone intentionally generates a key with a fingerprint whose
927final eight characters are the same as another, is unfortunately
928common.</p>
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929
930</div><!-- End .main -->
931</div><!-- End #step-identify_keys .step-->
932
933<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
934<div id="check-ids-before-signing" class="step">
935<div class="main">
936
937<h3><em>Important:</em> What to consider when signing keys</h3>
938
939<p>Before signing a person's key, you need to be confident that it actually
940belongs to them, and that they are who they say they are. Ideally, this
941confidence comes from having interactions and conversations with them over
942time, and witnessing interactions between them and others. Whenever signing
943a key, ask to see the full public key fingerprint, and not just the shorter
a4eb3926 944keyID. If you feel it's important to sign the key of someone you've just
19bce4d7 945met, also ask them to show you their government identification, and make
7b83f7f9 946sure the name on the ID matches the name on the public key.</p>
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947
948<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
949<div class="troubleshooting">
950
951<h4>Advanced</h4>
952
953<dl>
954<dt>Master the Web of Trust</dt>
955<dd>Unfortunately, trust does not spread between users the way <a
6003a573 956href="https://fennetic.net/irc/finney.org/~hal/web_of_trust.html">many people
a4eb3926 957think</a>. One of the best ways to strengthen the GnuPG community is to deeply <a
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958href="https://www.gnupg.org/gph/en/manual/x334.html">understand</a> the Web of
959Trust and to carefully sign as many people's keys as circumstances permit.</dd>
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960</dl>
961
962</div><!-- /.troubleshooting -->
963</div><!-- End .main -->
964</div><!-- End #check-ids-before-signing .step-->
7b83f7f9 965</div></section><!-- End #section5 -->
d85363e7 966
7b83f7f9 967<!-- ~~~~~~~~~ Section 6: Use it well ~~~~~~~~~ -->
968<section id="section6" class="row"><div>
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969
970<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
971<div class="section-intro">
972
7b83f7f9 973<h2><em>#6</em> Use it well</h2>
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974
975<p>Everyone uses GnuPG a little differently, but it's important to follow
976some basic practices to keep your email secure. Not following them, you
977risk the privacy of the people you communicate with, as well as your own,
978and damage the Web of Trust.</p>
979
980</div><!-- End .section-intro -->
981
982<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 983<div id="step-6a" class="step">
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984<div class="sidebar">
985
69e314de 986<p class="medium"><img
1805f65d 987src="../static/img/en/screenshots/section6-01-use-it-well.png"
7b83f7f9 988alt="Section 6: Use it Well (1)" /></p>
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989
990</div><!-- /.sidebar -->
991<div class="main">
992
993<h3>When should I encrypt? When should I sign?</h3>
994
995<p>The more you can encrypt your messages, the better. If you only encrypt
996emails occasionally, each encrypted message could raise a red flag for
997surveillance systems. If all or most of your email is encrypted, people
998doing surveillance won't know where to start. That's not to say that only
999encrypting some of your email isn't helpful -- it's a great start and it
1000makes bulk surveillance more difficult.</p>
1001
1002<p>Unless you don't want to reveal your own identity (which requires other
1003protective measures), there's no reason not to sign every message, whether or
1004not you are encrypting. In addition to allowing those with GnuPG to verify
1005that the message came from you, signing is a non-intrusive way to remind
1006everyone that you use GnuPG and show support for secure communication. If you
1007often send signed messages to people that aren't familiar with GnuPG, it's
1008nice to also include a link to this guide in your standard email signature
1009(the text kind, not the cryptographic kind).</p>
1010
1011</div><!-- End .main -->
7b83f7f9 1012</div><!-- End #step-6a .step -->
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1013
1014<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 1015<div id="step-6b" class="step">
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1016<div class="sidebar">
1017
69e314de 1018<p class="medium"><img
1805f65d 1019src="../static/img/en/screenshots/section6-02-use-it-well.png"
7b83f7f9 1020alt="Section 6: Use it Well (2)" /></p>
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1021
1022</div><!-- /.sidebar -->
1023<div class="main">
1024
1025<h3>Be wary of invalid keys</h3>
1026
1027<p>GnuPG makes email safer, but it's still important to watch out for invalid
1028keys, which might have fallen into the wrong hands. Email encrypted with
1029invalid keys might be readable by surveillance programs.</p>
1030
1031<p>In your email program, go back to the first encrypted email that Edward
1032sent you. Because Edward encrypted it with your public key, it will have a
80b64e11 1033green checkmark a at the top "OpenPGP" button.</p>
19bce4d7 1034
77aea16c 1035<p><strong>When using GnuPG, make a habit of glancing at that button. The program
4227f3fd 1036will warn you there if you get an email signed with a key that can't
77aea16c 1037be trusted.</strong></p>
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1038
1039</div><!-- End .main -->
7b83f7f9 1040</div><!-- End #step-6b .step -->
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1041
1042<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 1043<div id="step-6c" class="step">
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1044<div class="main">
1045
1046<h3>Copy your revocation certificate to somewhere safe</h3>
1047
1048<p>Remember when you created your keys and saved the revocation certificate
80b64e11 1049that GnuPG made? It's time to copy that certificate onto the safest storage that you have -- a flash drive, disk, or hard drive stored in a safe place in your home could work, not on a device you carry with you regularly. The safest way we know is actually to print the revocation certificate and store it in a safe place.</p>
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1050
1051<p>If your private key ever gets lost or stolen, you'll need this certificate
1052file to let people know that you are no longer using that keypair.</p>
1053
1054</div><!-- End .main -->
7b83f7f9 1055</div><!-- End #step-6c .step -->
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1056
1057<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
1058<div id="step-lost_key" class="step">
1059<div class="main">
1060
b7f7b4a2 1061<h3><em>IMPORTANT:</em> ACT SWIFTLY if someone gets your private key</h3>
19bce4d7 1062
b7f7b4a2 1063<p>If you lose your private key or someone else gets a hold
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1064of it (say, by stealing or cracking your computer), it's
1065important to revoke it immediately before someone else uses
1066it to read your encrypted email or forge your signature. This
1067guide doesn't cover how to revoke a key, but you can follow these <a
1068href="https://www.hackdiary.com/2004/01/18/revoking-a-gpg-key/">instructions</a>.
1069After you're done revoking, make a new key and send an email to everyone
1070with whom you usually use your key to make sure they know, including a copy
1071of your new key.</p>
1072
1073</div><!-- End .main -->
1074</div><!-- End #step-lost_key .step-->
1075
35f08087 1076<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
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1077<div id="webmail-and-GnuPG" class="step">
1078<div class="main">
1079
1080<h3>Webmail and GnuPG</h3>
1081
1082<p>When you use a web browser to access your email, you're using webmail,
1083an email program stored on a distant website. Unlike webmail, your desktop
1084email program runs on your own computer. Although webmail can't decrypt
1085encrypted email, it will still display it in its encrypted form. If you
1086primarily use webmail, you'll know to open your email client when you receive
1087a scrambled email.</p>
1088
1089</div><!-- End .main -->
1090</div><!-- End #webmail-and-GnuPG .step-->
1091
35f08087 1092<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 1093<div id="step-6d" class="step">
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1094<div class="main">
1095
1096<h3>Make your public key part of your online identity</h3>
1097
1098<p> First add your public key fingerprint to your email signature, then
1099compose an email to at least five of your friends, telling them you just
1100set up GnuPG and mentioning your public key fingerprint. Link to this guide
1101and ask them to join you. Don't forget that there's also an awesome <a
1102href="infographic.html">infographic to share.</a></p>
1103
1104<p class="notes">Start writing your public key fingerprint anywhere someone
1105would see your email address: your social media profiles, blog, Website,
1106or business card. (At the Free Software Foundation, we put ours on our
1107<a href="https://fsf.org/about/staff">staff page</a>.) We need to get our
1108culture to the point that we feel like something is missing when we see an
1109email address without a public key fingerprint.</p>
1110
35f08087 1111</div><!-- End .main-->
1112</div><!-- End #step-6d .step-->
7b83f7f9 1113</div></section><!-- End #section6 -->
19bce4d7 1114
7b83f7f9 1115<!-- ~~~~~~~~~ Section 7: Next steps ~~~~~~~~~ -->
b7f7b4a2 1116<section class="row" id="section7">
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1117<div id="step-click_here" class="step">
1118<div class="main">
0a225228 1119
19bce4d7 1120<h2><a href="next_steps.html">Great job! Check out the next steps.</a></h2>
bb28ee32 1121
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1122</div><!-- End .main -->
1123</div><!-- End #step-click_here .step-->
7b83f7f9 1124</section><!-- End #section7 -->
bdf319c4 1125
19bce4d7 1126<!-- ~~~~~~~~~ FAQ ~~~~~~~~~ -->
f44dd62f 1127<!-- When un-commenting this section go to main.css and search
116f80c3 1128for /* Guide Sections Background */ then add #faq to the desired color
19bce4d7 1129<section class="row" id="faq"><div>
116f80c3 1130<div class="sidebar">
19bce4d7 1131
116f80c3 1132<h2>FAQ</h2>
6c495e2d 1133
19bce4d7 1134</div>
116f80c3 1135<div class="main">
19bce4d7 1136
116f80c3
ZR
1137<dl>
1138<dt>My key expired</dt>
1139<dd>Answer coming soon.</dd>
6c495e2d 1140
116f80c3
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1141<dt>Who can read encrypted messages? Who can read signed ones?</dt>
1142<dd>Answer coming soon.</dd>
6c495e2d 1143
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1144<dt>My email program is opening at times I don't want it to open/is now my
1145default program and I don't want it to be.</dt>
116f80c3
ZR
1146<dd>Answer coming soon.</dd>
1147</dl>
19bce4d7 1148
116f80c3
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1149</div>
1150</div>
1151</section> --><!-- End #faq -->
bdf319c4 1152
19bce4d7
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1153<!-- ~~~~~~~~~ Footer ~~~~~~~~~ -->
1154<footer class="row" id="footer"><div>
1155<div id="copyright">
1156
1157<h4><a href="https://u.fsf.org/ys"><img
1158alt="Free Software Foundation"
14c5f099 1159src="../static/img/fsf-logo.png" /></a></h4>
19bce4d7 1160
37d0bc33 1161<p>Copyright &copy; 2014-2021 <a
19bce4d7
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1162href="https://u.fsf.org/ys">Free Software Foundation</a>, Inc. <a
1163href="https://my.fsf.org/donate/privacypolicy.html">Privacy Policy</a>. Please
1164support our work by <a href="https://u.fsf.org/yr">joining us as an associate
1165member.</a></p>
1166
1167<p>The images on this page are under a <a
1168href="https://creativecommons.org/licenses/by/4.0/">Creative Commons
1169Attribution 4.0 license (or later version)</a>, and the rest of it is under
1170a <a href="https://creativecommons.org/licenses/by-sa/4.0">Creative Commons
1171Attribution-ShareAlike 4.0 license (or later version)</a>. Download the <a
6003a573 1172href="https://agpl.fsf.org/emailselfdefense.fsf.org/edward/CURRENT/edward.tar.gz">
f211d856 1173source code of Edward reply bot</a> by Andrew Engelbrecht
a3a9a0ac 1174&lt;andrew@engelbrecht.io&gt; and Josh Drake &lt;zamnedix@gnu.org&gt;,
19bce4d7 1175available under the GNU Affero General Public License. <a
6003a573 1176href="https://www.gnu.org/licenses/license-list.html#OtherLicenses">Why these
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1177licenses?</a></p>
1178
1179<p>Fonts used in the guide &amp; infographic: <a
1180href="https://www.google.com/fonts/specimen/Dosis">Dosis</a> by Pablo
6003a573 1181Impallari, <a href="https://www.google.com/fonts/specimen/Signika">Signika</a>
19bce4d7 1182by Anna Giedry&#347;, <a
6003a573 1183href="https://www.google.com/fonts/specimen/Archivo+Narrow">Archivo
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1184Narrow</a> by Omnibus-Type, <a
1185href="https://libreplanet.org/wiki/GPG_guide/Graphics_Howto#Pitfalls">PXL-2000</a>
1186by Florian Cramer.</p>
1187
1188<p>Download the <a href="emailselfdefense_source.zip">source package</a>
1189for this guide, including fonts, image source files and the text of Edward's
1190messages.</p>
1191
1192<p>This site uses the Weblabels standard for labeling <a
1193href="https://www.fsf.org/campaigns/freejs">free JavaScript</a>. View
abf30801 1194the JavaScript <a href="https://weblabels.fsf.org/emailselfdefense.fsf.org/"
19bce4d7
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1195rel="jslicense">source code and license information</a>.</p>
1196
1197</div><!-- /#copyright -->
1198
1199<p class="credits">Infographic and guide design by <a rel="external"
6003a573 1200href="https://jplusplus.org"><strong>Journalism++</strong><img
138192ae 1201src="static/img/jplusplus.png"
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1202alt="Journalism++" /></a></p><!-- /.credits -->
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116f80c3 1204
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