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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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e59c77da 18<!--<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to Enigmail's PGP functionality being migrated into Icedove and Thunderbird, steps 2 and 3 of the guide are currently out of date.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 19
f12cd56f 20<!-- PLACE FUNDRAISER MODAL WINDOW HERE -->
aa082aba 21
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22<!-- ~~~~~~~~~ GnuPG Header and introduction text ~~~~~~~~~ -->
23<header class="row" id="header"><div>
116f80c3 24
e59c77da 25
19bce4d7 26<h1>Email Self-Defense</h1>
116f80c3 27
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28<!-- Language list for browsers that do not have JS enabled -->
29<ul id="languages" class="os">
de17dfbe 30<li><a class="current" href="/en">English - v5.0</a></li>
7c252a78 31<li><a href="/es">español - v5.0</a></li>
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32<li><a href="/fr">français - v5.0</a></li>
33<li><a href="/tr">Türkçe - v5.0</a></li>
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39<li><a href="/ja">日本語 - v4.0</a></li>
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a78dcf32 41<li><a href="/ro">română - v3.0</a></li>-->
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42<li><a href="/ru">русский - v5.0</a></li>
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46<li><strong><a href="https://libreplanet.org/wiki/GPG_guide/Translation_Guide">
47Translate!</a></strong></li>
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48</ul>
49
50<ul id="menu" class="os">
37d0bc33 51<li class="spacer"><a href="index.html" class="current">Set up guide</a></li>
52<!--<li><a href="mac.html">Mac OS</a></li>-->
53<!--<li><a href="windows.html">Windows</a></li>-->
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54<li class="spacer"><a href="workshops.html">Teach your friends</a></li>
55<li class="spacer"><a
770452f9 56href="https://fsf.org/share?u=https://u.fsf.org/zb&amp;t=Email%20encryption%20for%20everyone%20via%20%40fsf">
f211d856 57Share&nbsp;
14c5f099 58<img src="../static/img/gnu-social.png" class="share-logo"
19bce4d7 59alt="[GNU Social]" />&nbsp;
14c5f099 60<img src="../static/img/mastodon.png" class="share-logo"
d06ce723 61alt="[Mastodon]" />&nbsp;
14c5f099 62<img src="../static/img/reddit-alien.png" class="share-logo"
19bce4d7 63alt="[Reddit]" />&nbsp;
14c5f099 64<img src="../static/img/hacker-news.png" class="share-logo"
f211d856 65alt="[Hacker News]" /></a></li>
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66</ul>
67
68<!-- ~~~~~~~~~ FSF Introduction ~~~~~~~~~ -->
69<div id="fsf-intro">
70
6003a573 71<h3><a href="https://u.fsf.org/ys"><img
19bce4d7 72alt="Free Software Foundation"
14c5f099 73src="../static/img/fsf-logo.png" />
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74</a></h3>
75
76<div class="fsf-emphasis">
77
78<p>We fight for computer users' rights, and promote the development of free (as
79in freedom) software. Resisting bulk surveillance is very important to us.</p>
80
81<p><strong>Please donate to support Email Self-Defense. We need to keep
82improving it, and making more materials, for the benefit of people around
83the world taking the first step towards protecting their privacy.</strong></p>
84
85</div>
86
87<p><a
0dacb163 88href="https://crm.fsf.org/civicrm/contribute/transact?reset=1&amp;id=14&amp;mtm_campaign=email_self_defense&amp;mtm_kwd=guide_donate"><img
19bce4d7 89alt="Donate"
14c5f099 90src="../static/img/en/donate.png" /></a></p>
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91
92</div><!-- End #fsf-intro -->
93
94<!-- ~~~~~~~~~ Guide Introduction ~~~~~~~~~ -->
95<div class="intro">
96
97<p><a id="infographic" href="infographic.html"><img
14c5f099 98src="../static/img/en/infographic-button.png"
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99alt="View &amp; share our infographic &rarr;" /></a>
100Bulk surveillance violates our fundamental rights and makes free speech
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101risky. This guide will teach you a basic surveillance self-defense skill: email
102encryption. Once you've finished, you'll be able to send and receive emails
103that are scrambled to make sure a surveillance agent or thief intercepting
104your email can't read them. All you need is a computer with an Internet
105connection, an email account, and about forty minutes.</p>
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106
107<p>Even if you have nothing to hide, using encryption helps protect the privacy
108of people you communicate with, and makes life difficult for bulk surveillance
109systems. If you do have something important to hide, you're in good company;
110these are the same tools that whistleblowers use to protect their identities
80b64e11 111while shining light on human rights abuses, corruption, and other crimes.</p>
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112
113<p>In addition to using encryption, standing up
114to surveillance requires fighting politically for a <a
e59c77da 115href="https://gnu.org/philosophy/surveillance-vs-democracy.html">reduction
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116in the amount of data collected on us</a>, but the essential first step is
117to protect yourself and make surveillance of your communication as difficult
118as possible. This guide helps you do that. It is designed for beginners, but
119if you already know the basics of GnuPG or are an experienced free software
120user, you'll enjoy the advanced tips and the <a href="workshops.html">guide
121to teaching your friends</a>.</p>
122
123</div><!-- End .intro -->
124</div></header><!-- End #header -->
125
126<!-- ~~~~~~~~~ Section 1: Get the pieces ~~~~~~~~~ -->
127<section class="row" id="section1"><div>
128
129<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
130<div class="section-intro">
131
132<h2><em>#1</em> Get the pieces</h2>
133
134<p class="notes">This guide relies on software which is <a
135href="https://www.gnu.org/philosophy/free-sw.html">freely licensed</a>;
136it's completely transparent and anyone can copy it or make their
137own version. This makes it safer from surveillance than proprietary
80b64e11 138software (like Windows or macOS). Learn more about free software at <a
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139href="https://u.fsf.org/ys">fsf.org</a>.</p>
140
c174e65c 141<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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143</div><!-- End .section-intro -->
144
145<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
146<div id="step-1a" class="step">
147<div class="sidebar">
148
69e314de 149<p class="large"><img
14c5f099 150src="../static/img/en/screenshots/step1a-install-wizard.png"
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151alt="Step 1.A: Install Wizard" /></p>
152
153</div><!-- /.sidebar -->
154<div class="main">
155
156<h3><em>Step 1.a</em> Set up your email program with your email account</h3>
157
158<p>Open your email program and follow the wizard (step-by-step walkthrough)
37d0bc33 159that 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 160
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161
162<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
163<div class="troubleshooting">
164
165<h4>Troubleshooting</h4>
166
167<dl>
168<dt>The wizard doesn't launch</dt>
169<dd>You can launch the wizard yourself, but the menu option for doing so is
170named differently in each email program. The button to launch it will be in
171the program's main menu, under "New" or something similar, titled something
172like "Add account" or "New/Existing email account."</dd>
173
174<dt>The wizard can't find my account or isn't downloading my mail</dt>
175<dd>Before searching the Web, we recommend you start by asking other people
176who use your email system, to figure out the correct settings.</dd>
177
b7f7b4a2 178<dt>I can't find the menu</dt>
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179<dd>In many new email programs, the main menu is represented by an image of
180three stacked horizontal bars.</dd>
181
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182<dt class="feedback">Don't see a solution to your problem?</dt>
183<dd class="feedback">Please let us know on the <a
184href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
185page</a>.</dd>
186</dl>
187
188</div><!-- /.troubleshooting -->
189</div><!-- End .main -->
190</div><!-- End #step1-a .step -->
191
192<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
193<div id="step-1b" class="step">
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194<div class="main">
195
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196<h3><em>Step 1.b</em> Install GnuPG</h3>
197
198<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 199
63fe86d5 200<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 201
37d0bc33 202<!-- ~~~~~~~~~ MACOS ~~~~~~~~~ -->
203<div class="troubleshooting">
19bce4d7 204
77aea16c 205<h4>macOS</h4>
64af8734 206
37d0bc33 207<dl>
208<dt>Use a third-party package manager to install GnuPG</dt>
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209<dd>
210<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>
211
212<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>
213<p># Then install GnuPG by entering the following code in Terminal:<br/>
214<code>brew install gnupg gnupg2</code></p>
215</dd>
37d0bc33 216</dl>
217
218</div><!-- /.troubleshooting -->
219
220<!-- ~~~~~~~~~ WINDOWS ~~~~~~~~~ -->
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221<div class="troubleshooting">
222
37d0bc33 223<h4>Windows</h4>
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224
225<dl>
37d0bc33 226<dt>Get GnuPG by downloading GPG4Win</dt>
b4a6695d 227<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 228</dd>
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229</dl>
230
231</div><!-- /.troubleshooting -->
232</div><!-- End .main -->
37d0bc33 233</div><!-- End #step1-b .step -->
234
80b64e11 235<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
236<div id="terminology" class="step">
237<div class="main">
238
a4eb3926 239<h3>GnuPG, OpenPGP, what?</h3>
80b64e11 240
241<p>In general, the terms GnuPG, GPG, GNU Privacy Guard, OpenPGP and PGP
242are used interchangeably. Technically, OpenPGP (Pretty Good Privacy) is the
243encryption standard, and GNU Privacy Guard (often shortened to GPG or GnuPG)
244is 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>
245
246</div><!-- End .main -->
247</div><!-- End #terminology.step-->
248
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249</div></section><!-- End #section1 -->
250
251<!-- ~~~~~~~~~ Section 2: Make your keys ~~~~~~~~~ -->
7b83f7f9 252<section id="section2" class="row"><div>
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253
254<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
255<div class="section-intro">
256
257<h2><em>#2</em> Make your keys</h2>
69e314de 258<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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259
260<p>To use the GnuPG system, you'll need a public key and a private key (known
261together as a keypair). Each is a long string of randomly generated numbers
262and letters that are unique to you. Your public and private keys are linked
263together by a special mathematical function.</p>
264
265<p>Your public key isn't like a physical key, because it's stored in the open
266in an online directory called a keyserver. People download it and use it,
267along with GnuPG, to encrypt emails they send to you. You can think of the
268keyserver as a phonebook; people who want to send you encrypted email can
269look up your public key.</p>
270
271<p>Your private key is more like a physical key, because you keep it to
272yourself (on your computer). You use GnuPG and your private key together to
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273descramble encrypted emails other people send to you. <strong>You should never share your private key with anyone, under any
274circumstances.</strong></p>
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275
276<p>In addition to encryption and decryption, you can also use these keys to
277sign messages and check the authenticity of other people's signatures. We'll
278discuss this more in the next section.</p>
279
280</div><!-- End .section-intro -->
281
282<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
283<div id="step-2a" class="step">
284<div class="sidebar">
69e314de 285<p class="large"><img
14c5f099 286src="../static/img/en/screenshots/step2a-02-make-keypair.png"
35f08087 287alt="Step 2.A: Make your Keypair" /></p>
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288
289<p class="large"><img
14c5f099 290src="../static/img/en/screenshots/step2a-03-make-keypair.png"
7b83f7f9 291alt="Step 2.A: Set your passphrase" /></p>
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292
293</div><!-- /.sidebar -->
294<div class="main">
295
296<h3><em>Step 2.a</em> Make a keypair</h3>
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297
298<h4>Make your keypair</h4>
19bce4d7 299
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300<p>We will use the command line in a terminal to create a keypair using the
301GnuPG program.</p>
19bce4d7 302
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303<p class="notes">Whether on GNU/Linux, macOS or Windows, you can launch your
304terminal ("Terminal" in macOS, "PowerShell" in Windows) from the Applications
305menu (some GNU/Linux systems respond to the <kbd>Ctrl + Alt + T</kbd>
306shortcut).</p>
307
308<p># Enter <code>gpg --full-generate-key</code> to start the process.</p>
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309<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>
310<p># Enter the following keysize: <code>4096</code> for a strong key.</p>
63fe86d5 311<p># Choose the expiration date; we suggest <code>2y</code> (2 years).</p>
e59c77da 312<p>Follow the prompts to continue setting up with your personal details.</p>
a7ba22c6 313<p class="notes"> Depending on your version of GPG, you may need to use <code>--gen-key</code> instead of <code>--full-generate-key</code>.</p>
19bce4d7 314
77aea16c 315<h4>Set your passphrase</h4>
7b83f7f9 316<p>On the screen titled "Passphrase," pick a strong password! You can
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317do it manually, or you can use the Diceware method. Doing it manually
318is faster but not as secure. Using Diceware takes longer and requires
4d10d72d 319dice, but creates a password that is much harder for attackers to figure
19bce4d7 320out. To use it, read the section "Make a secure passphrase with Diceware" in <a
f211d856 321href="https://theintercept.com/2015/03/26/passphrases-can-memorize-attackers-cant-guess/">
7b83f7f9 322this article</a> by Micah Lee.</p>
323
19bce4d7 324
7b83f7f9 325<p>If you'd like to pick a passphrase manually, come up with something
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326you can remember which is at least twelve characters long, and includes
327at least one lower case and upper case letter and at least one number or
328punctuation symbol. Never pick a password you've used elsewhere. Don't use
329any recognizable patterns, such as birthdays, telephone numbers, pets' names,
330song lyrics, quotes from books, and so on.</p>
331
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332<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
333<div class="troubleshooting">
334
335<h4>Troubleshooting</h4>
19bce4d7 336<dl>
e59c77da 337<dt>GnuPG is not installed</dt>
7b83f7f9 338<dd>
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339You can check if this is the case with the command <code>gpg --version</code>&#65279;.
340If 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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341<samp>Command 'gpg' not found, but can be installed with:
342 sudo apt install gnupg</samp>. Follow that command and install the program.</dd>
7b83f7f9 343
061aad83 344<dt><i>gpg --full-generate-key</i> command not working</dt>
412a3134 345<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 346<code>sudo apt update</code><br />
347<code>sudo apt install gnupg2</code><br />
348<code>gpg2 --full-generate-key</code><br />
a7ba22c6 349If this resolved the issue, you need to continue to use the gpg2 identifier instead of gpg throughout the following steps of the guide.
350<p class="notes"> Depending on your version of GPG, you may need to use <code>--gen-key</code> instead of <code>--full-generate-key</code>.</p></dd>
061aad83 351
7b83f7f9 352<dt>I took too long to create my passphrase</dt>
b7f7b4a2 353<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 354
b7f7b4a2 355<dt>How can I see my key?</dt>
7b83f7f9 356<dd>
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357Use 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 />
358If you want to see only your key, you can use <code>gpg --list-key [your@email]</code>&#65279;.<br />
77aea16c 359You can also use <code>gpg --list-secret-key</code> to see your own private key.</dd>
19bce4d7 360
19bce4d7 361<dt>More resources</dt>
7b83f7f9 362<dd>For more information about this process, you can also refer to <a
363href="https://www.gnupg.org/gph/en/manual/c14.html#AEN25">The GNU Privacy
364Handbook</a>. Make sure you stick with "RSA and RSA" (the default),
365because it's newer and more secure than the algorithms the documentation
63fe86d5 366recommends. Also make sure your key is at least 4096&nbsp;bits if you
80b64e11 367want to be secure.</dd>
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368
369<dt class="feedback">Don't see a solution to your problem?</dt>
370<dd class="feedback">Please let us know on the <a
371href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
372page</a>.</dd>
373</dl>
374
375</div><!-- /.troubleshooting -->
376
377<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
378<div class="troubleshooting">
379
380<h4>Advanced</h4>
19bce4d7 381<dl>
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382<dt>Advanced key pairs</dt>
383<dd>When GnuPG creates a new keypair, it compartmentalizes
384the encryption function from the signing function through <a
385href="https://wiki.debian.org/Subkeys">subkeys</a>. If you use
7b83f7f9 386subkeys carefully, you can keep your GnuPG identity more
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387secure and recover from a compromised key much more quickly. <a
388href="https://alexcabal.com/creating-the-perfect-gpg-keypair/">Alex Cabal</a>
6003a573 389and <a href="https://keyring.debian.org/creating-key.html">the Debian wiki</a>
19bce4d7 390provide good guides for setting up a secure subkey configuration.</dd>
64f8f564 391</dl>
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392
393</div><!-- /.troubleshooting -->
394</div><!-- End .main -->
395</div><!-- End #step-2a .step -->
396
397<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
398<div id="step-2b" class="step">
7b83f7f9 399<div class="sidebar">
69e314de 400<p class="large"><img
14c5f099 401src="../static/img/en/screenshots/step2b-04-upload-and-certificate.png"
80b64e11 402alt="Step 2.B: Send to server and generate a certificate" /></p>
19bce4d7 403
7b83f7f9 404</div><!-- /.sidebar -->
405<div class="main">
19bce4d7 406
7b83f7f9 407<h3><em>Step 2.b</em> Some important steps following creation</h3>
19bce4d7 408
77aea16c 409<h4>Upload your key to a keyserver</h4>
7b83f7f9 410<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 411that you can select from the menu when you upload, but they are mostly all copies
412of 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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413<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>
414<p># Upload your key to a server:
415<code>gpg --send-key [keyID]</code></p>
7b83f7f9 416
77aea16c 417<h4>Export your key to a file</h4>
4f41943f 418<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 419<p><code>
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420$ gpg --export-secret-keys -a [keyID] > my_secret_key.asc<br/>
421$ gpg --export -a [keyID] > my_public_key.asc
77aea16c 422</code></p>
7b83f7f9 423
77aea16c 424<h4>Generate a revocation certificate</h4>
63fe86d5 425<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 426
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427<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>
428<p># Generate a revocation certificate: <code>gpg --gen-revoke --output revoke.asc [keyID]</code></p>
429<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 430<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 431
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432
433<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
434<div class="troubleshooting">
435
436<h4>Troubleshooting</h4>
437
438<dl>
563fcf5d 439<dt>Sending my key to the keyserver is not working</dt>
412a3134 440<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 441
b7f7b4a2 442<dt>My key doesn't seem to be working or I get a "permission denied."</dt>
e4fa2e82 443<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 444
77aea16c 445<p># Check your permissions: <code>ls -l ~/.gnupg/*</code></p>
e4fa2e82 446<p># Set permissions to read, write, execute for only yourself, no others. These are the recommended permissions for your folder. <br/>
77aea16c 447You can use the code: <code>chmod 700 ~/.gnupg</code></p>
e4fa2e82 448<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 449You can use the code: <code>chmod 600 ~/.gnupg/*</code></p>
19bce4d7 450
e4fa2e82 451<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 452</dd>
412a3134 453
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454<dt class="feedback">Don't see a solution to your problem?</dt>
455<dd class="feedback">Please let us know on the <a
456href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
457page</a>.</dd>
458</dl>
459
460</div><!-- /.troubleshooting -->
461
462<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
463<div class="troubleshooting">
464
465<h4>Advanced</h4>
466
467<dl>
7b83f7f9 468<dt>More about keyservers</dt>
469<dd>You can find some more keyserver information<a
803e8e2e 470href="https://www.gnupg.org/gph/en/manual/x457.html"> in this manual</a>. <a
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471href="https://sks-keyservers.net/overview-of-pools.php">The sks Web site</a>
472maintains a list of highly interconnected keyservers. You can also <a
473href="https://www.gnupg.org/gph/en/manual/x56.html#AEN64">directly export
474your key</a> as a file on your computer.</dd>
7b83f7f9 475
476<dt>Transferring your keys</dt>
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477<dd>
478<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 479
77aea16c 480<p><code>
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481$ gpg --export-secret-keys -a [keyID] > my_private_key.asc<br />
482$ gpg --export -a [keyID] > my_public_key.asc<br />
483$ gpg --import my_private_key.asc<br />
e4fa2e82 484$ gpg --import my_public_key.asc
77aea16c 485</code></p>
7b83f7f9 486
35f08087 487<p>Ensure that the keyID printed is the correct one, and if so, then go ahead and add ultimate trust for it:</p>
e4fa2e82 488
77aea16c 489<p><code>
35f08087 490$ gpg --edit-key [your@email]
77aea16c 491</code></p>
7b83f7f9 492
dbfeba09 493<p>Because this is your key, you should choose <code>ultimate</code>&#65279;. You shouldn't trust anyone else's key ultimately.</p>
80b64e11 494
63fe86d5 495<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 496</dd>
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497</dl>
498
499</div><!-- /.troubleshooting -->
500</div><!-- End .main -->
501</div><!-- End #step-2b .step -->
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502</div></section><!-- End #section2 -->
503
7b83f7f9 504<!-- ~~~~~~~~~ Section 3: Set up email encryption ~~~~~~~~~ -->
505<section id="section3" class="row"><div>
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506
507<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
508<div class="section-intro">
509
7b83f7f9 510<h2><em>#3</em> Set up email encryption</h2>
64f8f564 511<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 512
513</div><!-- End .section-intro -->
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514
515<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 516<div id="step-3a" class="step">
517<div class="sidebar">
518
69e314de 519<p class="large"><img src="../static/img/en/screenshots/step3a-open-key-manager.png"
fedfd572 520alt="Step 3.A: Email Menu" /></p>
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521
522<p class="large"><img src="../static/img/en/screenshots/step3a-import-from-file.png"
7b83f7f9 523alt="Step 3.A: Import From File" /></p>
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524
525<p class="large"><img src="../static/img/en/screenshots/step3a-success.png"
7b83f7f9 526alt="Step 3.A: Success" /></p>
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527
528<p class="large"><img src="../static/img/en/screenshots/step3a-troubleshoot.png"
40833450 529alt="Step 3.A: Troubleshoot" /></p>
7b83f7f9 530</div><!-- /.sidebar -->
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531<div class="main">
532
7b83f7f9 533<h3><em>Step 3.a</em> Set up your email with encryption</h3>
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534
535<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 536
fb4dff9b 537<p># Open your email client and use "Tools" &rarr; <i>OpenPGP Key Manager</i></p>
77aea16c 538<p># Under "File" &rarr; <i>Import Secret Key(s) From File</i></p>
63fe86d5 539<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 540<p># Unlock with your passphrase</p>
541<p># You will receive a "OpenPGP keys successfully imported" window to confirm success</p>
fb4dff9b 542<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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543
544</div><!-- End .main -->
19bce4d7 545
7b83f7f9 546<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
7b83f7f9 547<div class="main">
548<div class="troubleshooting">
549<h4>Troubleshooting</h4>
550<dl>
551<dt>I'm not sure the import worked correctly</dt>
552<dd>
fb4dff9b 553Look 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 554</dd>
555
556<dt class="feedback">Don't see a solution to your problem?</dt>
557<dd class="feedback">Please let us know on the <a
558href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
559page</a>.</dd>
560</dl>
561
562</div><!-- /.troubleshooting -->
563</div><!-- End .main -->
564</div><!-- End #step3-a .step -->
565</div></section><!-- End #section3 -->
566
567<!-- ~~~~~~~~~ Section 4: Try it out ~~~~~~~~~ -->
568<section class="row" id="section4"><div>
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569
570<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
571<div class="section-intro">
572
7b83f7f9 573<h2><em>#4</em> Try it out!</h2>
69e314de 574<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 575<p>Now you'll try a test correspondence with an FSF computer program named Edward,
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576who knows how to use encryption. Except where noted, these are the same
577steps you'd follow when corresponding with a real, live person.</p>
578
579<!-- <p>NOTE: Edward is currently having some technical difficulties, so he
580may take a long time to respond, or not respond at all. We're sorry about
581this and we're working hard to fix it. Your key will still work even without
582testing with Edward.</p> -->
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583
584<div style="clear: both"></div>
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585</div><!-- End .section-intro -->
586
587<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 588<div id="step-4a" class="step">
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589<div class="sidebar">
590
69e314de 591<p class="large"><img
14c5f099 592src="../static/img/en/screenshots/step4a-send-key-to-Edward.png"
7b83f7f9 593alt="Step 4.A Send key to Edward." /></p>
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594
595</div><!-- /.sidebar -->
596<div class="main">
597
7b83f7f9 598<h3><em>Step 4.a</em> Send Edward your public key</h3>
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599
600<p>This is a special step that you won't have to do when corresponding
7b83f7f9 601with real people. In your email program's menu, go to "Tools" &rarr; "OpenPGP Key
a4eb3926 602Manager." You should see your key in the list that pops up. Right click
77aea16c 603on 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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604
605<p>Address the message to <a
606href="mailto:edward-en@fsf.org">edward-en@fsf.org</a>. Put at least one word
607(whatever you want) in the subject and body of the email. Don't send yet.</p>
608
77aea16c 609<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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610
611<p class="notes">It may take two or three minutes for Edward to
612respond. In the meantime, you might want to skip ahead and check out the <a
b7f7b4a2 613href="#section6">Use it Well</a> section of this guide. Once you have received a response,
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614head to the next step. From here on, you'll be doing just the same thing as
615when corresponding with a real person.</p>
616
7b83f7f9 617<p>When you open Edward's reply, GnuPG may prompt you for your passphrase
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618before using your private key to decrypt it.</p>
619
620</div><!-- End .main -->
7b83f7f9 621</div><!-- End #step-4a .step -->
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622
623<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 624<div id="step-4b" class="step">
625<div class="sidebar">
19bce4d7 626
69e314de 627<p class="large"><img
14c5f099 628src="../static/img/en/screenshots/step4b-option1-verify-key.png"
7b83f7f9 629alt="Step 4.B Option 1. Verify key" /></p>
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630
631<p class="large"><img
14c5f099 632src="../static/img/en/screenshots/step4b-option2-import-key.png"
7b83f7f9 633alt="Step 4.B Option 2. Import key" /></p>
634</div><!-- /.sidebar -->
19bce4d7 635
7b83f7f9 636<div class="main">
19bce4d7 637
7b83f7f9 638<h3><em>Step 4.b</em> Send a test encrypted email</h3>
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639
640<h4>Get Edward's key</h4>
641
80b64e11 642<p>To encrypt an email to Edward, you need its public key, so now you'll have
7b83f7f9 643to download it from a keyserver. You can do this in two different ways:</p>
fb4dff9b 644<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 645
fb4dff9b 646<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 647
77aea16c 648<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 649
b7f7b4a2 650<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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651
652<p class="notes">Since you encrypted this email with Edward's public key,
653Edward's private key is required to decrypt it. Edward is the only one with
80b64e11 654its private key, so no one except Edward can decrypt it.</p>
19bce4d7 655
77aea16c 656<h4>Send Edward an encrypted email</h4>
7b83f7f9 657
a4eb3926 658<p> Write a new email in your email program, addressed to <a
7b83f7f9 659href="mailto:edward-en@fsf.org">edward-en@fsf.org</a>. Make the subject
660"Encryption test" or something similar and write something in the body.</p>
661
77aea16c 662<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 663
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664
665<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
666<div class="troubleshooting">
667
668<h4>Troubleshooting</h4>
669
670<dl>
7b83f7f9 671<dt>"Recipients not valid, not trusted or not found"</dt>
412a3134 672<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 673
674<dt>Unable to send message</dt>
77aea16c 675<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 676
677<dt>I can't find Edward's key</dt>
19bce4d7 678<dd>Close the pop-ups that have appeared since you clicked Send. Make sure
412a3134 679you 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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680
681<dt>Unscrambled messages in the Sent folder</dt>
682<dd>Even though you can't decrypt messages encrypted to someone else's key,
683your email program will automatically save a copy encrypted to your public key,
684which you'll be able to view from the Sent folder like a normal email. This
685is normal, and it doesn't mean that your email was not sent encrypted.</dd>
686
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687<dt class="feedback">Don't see a solution to your problem?</dt>
688<dd class="feedback">Please let us know on the <a
689href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
690page</a>.</dd>
691</dl>
692
693</div><!-- /.troubleshooting -->
694
695<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
696<div class="troubleshooting">
697
698<h4>Advanced</h4>
699
700<dl>
701<dt>Encrypt messages from the command line</dt>
702<dd>You can also encrypt and decrypt messages and files from the <a
703href="https://www.gnupg.org/gph/en/manual/x110.html">command line</a>,
704if that's your preference. The option --armor makes the encrypted output
705appear in the regular character set.</dd>
706</dl>
707
708</div><!-- /.troubleshooting -->
709</div><!-- End .main -->
7b83f7f9 710</div><!-- End #step-4b .step -->
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711
712<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
713<div id="step-headers_unencrypted" class="step">
714<div class="main">
715
716<h3><em>Important:</em> Security tips</h3>
19e80165 717
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718<p>Even if you encrypt your email, the subject line is not encrypted, so
719don't put private information there. The sending and receiving addresses
720aren't encrypted either, so a surveillance system can still figure out who
721you're communicating with. Also, surveillance agents will know that you're
722using GnuPG, even if they can't figure out what you're saying. When you
7b83f7f9 723send attachments, you can choose to encrypt them or not,
19bce4d7 724independent of the actual email.</p>
bdf319c4 725
e72398d7
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726<p>For greater security against potential attacks, you can turn off
727HTML. Instead, you can render the message body as plain text. In order
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728to do this in Icedove or Thunderbird, go to "View" &rarr; "Message Body As" &rarr; <i>Plain
729Text</i>.</p>
e72398d7 730
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731</div><!-- End .main -->
732</div><!-- End #step-headers_unencrypted .step-->
d85363e7 733
19bce4d7 734<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 735<div id="step-4c" class="step">
736<div class="sidebar">
737
69e314de 738<p class="large"><img
14c5f099 739src="../static/img/en/screenshots/step4c-Edward-response.png"
7b83f7f9 740alt="Step 4.C Edward's response" /></p>
741
742</div><!-- /.sidebar -->
743
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744<div class="main">
745
7b83f7f9 746<h3><em>Step 4.c</em> Receive a response</h3>
19bce4d7 747
80b64e11 748<p>When Edward receives your email, it will use its private key to decrypt
f54f2134 749it, then reply to you. </p>
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750
751<p class="notes">It may take two or three minutes for Edward to
752respond. In the meantime, you might want to skip ahead and check out the <a
7b83f7f9 753href="#section6">Use it Well</a> section of this guide.</p>
754
169c7097 755<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 756
f2545138 757<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 758
19bce4d7 759</div><!-- End .main -->
7b83f7f9 760</div><!-- End #step-4c .step -->
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761
762<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 763<div id="step-4d" class="step">
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764<div class="main">
765
80b64e11 766<h3><em>Step 4.d</em> Send a signed test email</h3>
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767
768<p>GnuPG includes a way for you to sign messages and files, verifying that
769they came from you and that they weren't tampered with along the way. These
770signatures are stronger than their pen-and-paper cousins -- they're impossible
771to forge, because they're impossible to create without your private key
772(another reason to keep your private key safe).</p>
773
774<p>You can sign messages to anyone, so it's a great way to make people
775aware that you use GnuPG and that they can communicate with you securely. If
776they don't have GnuPG, they will be able to read your message and see your
777signature. If they do have GnuPG, they'll also be able to verify that your
778signature is authentic.</p>
779
a4eb3926 780<p>To sign an email to Edward, compose any message to the email address and click the
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781pencil icon next to the lock icon so that it turns gold. If you sign a
782message, GnuPG may ask you for your password before it sends the message,
783because it needs to unlock your private key for signing.</p>
784
77aea16c 785<p>In "Account Settings" &rarr; "End-To-End-Encryption" you can opt to <i>add digital signature by default</i>.</p>
19bce4d7 786
7b83f7f9 787</div><!-- End .main -->
788</div><!-- End #step-4d .step -->
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789
790<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 791<div id="step-4e" class="step">
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792<div class="main">
793
7b83f7f9 794<h3><em>Step 4.e</em> Receive a response</h3>
19bce4d7 795
f54f2134
Z
796<p>When Edward receives your email, he will use your public key (which
797you sent him in <a href="#step-3a">Step 3.A</a>) to verify the message
80b64e11 798you sent has not been tampered with and to encrypt a reply to you.</p>
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799
800<p class="notes">It may take two or three minutes for Edward to
801respond. In the meantime, you might want to skip ahead and check out the <a
7b83f7f9 802href="#section6">Use it Well</a> section of this guide.</p>
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803
804<p>Edward's reply will arrive encrypted, because he prefers to use encryption
805whenever possible. If everything goes according to plan, it should say
806"Your signature was verified." If your test signed email was also encrypted,
807he will mention that first.</p>
808
7b83f7f9 809<p>When you receive Edward's email and open it, your email client will
f54f2134
Z
810automatically detect that it is encrypted with your public key, and
811then it will use your private key to decrypt it.</p>
812
19bce4d7 813</div><!-- End .main -->
7b83f7f9 814</div><!-- End #step-4e .step -->
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815</div></section>
816
803e8e2e 817<!-- ~~~~~~~~~ Section 5: Learn About the Web of Trust ~~~~~~~~~ -->
7b83f7f9 818<section class="row" id="section5"><div>
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819
820<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
821<div class="section-intro">
822
b7f7b4a2 823<h2><em>#5</em> Learn about the Web of Trust</h2>
69e314de 824<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 825
b7f7b4a2 826<p>Email encryption is a powerful technology, but it has a weakness:
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827it requires a way to verify that a person's public key is actually
828theirs. Otherwise, there would be no way to stop an attacker from making
b7f7b4a2 829an email address with your friend's name, creating keys to go with it, and
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830impersonating your friend. That's why the free software programmers that
831developed email encryption created keysigning and the Web of Trust.</p>
832
833<p>When you sign someone's key, you are publicly saying that you've verified
834that it belongs to them and not someone else.</p>
835
836<p>Signing keys and signing messages use the same type of mathematical
837operation, but they carry very different implications. It's a good practice
838to generally sign your email, but if you casually sign people's keys, you
77aea16c 839may accidentally end up vouching for the identity of an imposter.</p>
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840
841<p>People who use your public key can see who has signed it. Once you've
842used GnuPG for a long time, your key may have hundreds of signatures. You
843can consider a key to be more trustworthy if it has many signatures from
844people that you trust. The Web of Trust is a constellation of GnuPG users,
845connected to each other by chains of trust expressed through signatures.</p>
846
847</div><!-- End .section-intro -->
848
849<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 850<div id="step-5a" class="step">
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851<div class="sidebar">
852
69e314de 853<p class="large"><img
14c5f099 854src="../static/img/en/screenshots/step5a-key-properties.png"
7b83f7f9 855alt="Section 5: trusting a key" /></p>
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856
857</div><!-- /.sidebar -->
858<div class="main">
859
7b83f7f9 860<h3><em>Step 5.a</em> Sign a key</h3>
19bce4d7 861
77aea16c 862<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 863
77aea16c 864<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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865
866<p class="notes">You've just effectively said "I trust that Edward's public
867key actually belongs to Edward." This doesn't mean much because Edward isn't
b7f7b4a2 868a 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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869
870<!--<div id="pgp-pathfinder">
871
872<form enctype="application/x-www-form-urlencoded" action="/mk_path.cgi"
873method="get">
874
f211d856 875<p><strong>From:</strong><input type="text" value="xD41A008"
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876name="FROM"></p>
877
f211d856 878<p><strong>To:</strong><input type="text" value="50BD01x4" name="TO"></p>
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879
880<p class="buttons"><input type="submit" value="trust paths" name="PATHS"><input
881type="reset" value="reset" name=".reset"></p>
882
883</form>
884
885</div>End #pgp-pathfinder -->
886</div><!-- End .main -->
7b83f7f9 887</div><!-- End #step-5a .step -->
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888
889<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
890<div id="step-identify_keys" class="step">
891<div class="main">
892
893<h3>Identifying keys: Fingerprints and IDs</h3>
894
895<p>People's public keys are usually identified by their key fingerprint,
896which is a string of digits like F357AA1A5B1FA42CFD9FE52A9FF2194CC09A61E8
897(for Edward's key). You can see the fingerprint for your public key, and
7b83f7f9 898other public keys saved on your computer, by going to OpenPGP Key
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899Management in your email program's menu, then right clicking on the key
900and choosing Key Properties. It's good practice to share your fingerprint
901wherever you share your email address, so that people can double-check that
902they have the correct public key when they download yours from a keyserver.</p>
903
c0c01f86 904<p class="notes">You may also see public keys referred to by a shorter
a4eb3926 905keyID. This keyID is visible directly from the Key Management
906window. These eight character keyIDs were previously used for
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907identification, which used to be safe, but is no longer reliable. You
908need to check the full fingerprint as part of verifying you have the
909correct key for the person you are trying to contact. Spoofing, in
910which someone intentionally generates a key with a fingerprint whose
911final eight characters are the same as another, is unfortunately
912common.</p>
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913
914</div><!-- End .main -->
915</div><!-- End #step-identify_keys .step-->
916
917<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
918<div id="check-ids-before-signing" class="step">
919<div class="main">
920
921<h3><em>Important:</em> What to consider when signing keys</h3>
922
923<p>Before signing a person's key, you need to be confident that it actually
924belongs to them, and that they are who they say they are. Ideally, this
925confidence comes from having interactions and conversations with them over
926time, and witnessing interactions between them and others. Whenever signing
927a key, ask to see the full public key fingerprint, and not just the shorter
a4eb3926 928keyID. If you feel it's important to sign the key of someone you've just
19bce4d7 929met, also ask them to show you their government identification, and make
7b83f7f9 930sure the name on the ID matches the name on the public key.</p>
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931
932<!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
933<div class="troubleshooting">
934
935<h4>Advanced</h4>
936
937<dl>
938<dt>Master the Web of Trust</dt>
939<dd>Unfortunately, trust does not spread between users the way <a
6003a573 940href="https://fennetic.net/irc/finney.org/~hal/web_of_trust.html">many people
a4eb3926 941think</a>. One of the best ways to strengthen the GnuPG community is to deeply <a
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942href="https://www.gnupg.org/gph/en/manual/x334.html">understand</a> the Web of
943Trust and to carefully sign as many people's keys as circumstances permit.</dd>
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944</dl>
945
946</div><!-- /.troubleshooting -->
947</div><!-- End .main -->
948</div><!-- End #check-ids-before-signing .step-->
7b83f7f9 949</div></section><!-- End #section5 -->
d85363e7 950
7b83f7f9 951<!-- ~~~~~~~~~ Section 6: Use it well ~~~~~~~~~ -->
952<section id="section6" class="row"><div>
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953
954<!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
955<div class="section-intro">
956
7b83f7f9 957<h2><em>#6</em> Use it well</h2>
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958
959<p>Everyone uses GnuPG a little differently, but it's important to follow
960some basic practices to keep your email secure. Not following them, you
961risk the privacy of the people you communicate with, as well as your own,
962and damage the Web of Trust.</p>
963
964</div><!-- End .section-intro -->
965
966<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 967<div id="step-6a" class="step">
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968<div class="sidebar">
969
69e314de 970<p class="medium"><img
1805f65d 971src="../static/img/en/screenshots/section6-01-use-it-well.png"
7b83f7f9 972alt="Section 6: Use it Well (1)" /></p>
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973
974</div><!-- /.sidebar -->
975<div class="main">
976
977<h3>When should I encrypt? When should I sign?</h3>
978
979<p>The more you can encrypt your messages, the better. If you only encrypt
980emails occasionally, each encrypted message could raise a red flag for
981surveillance systems. If all or most of your email is encrypted, people
982doing surveillance won't know where to start. That's not to say that only
983encrypting some of your email isn't helpful -- it's a great start and it
984makes bulk surveillance more difficult.</p>
985
986<p>Unless you don't want to reveal your own identity (which requires other
987protective measures), there's no reason not to sign every message, whether or
988not you are encrypting. In addition to allowing those with GnuPG to verify
989that the message came from you, signing is a non-intrusive way to remind
990everyone that you use GnuPG and show support for secure communication. If you
991often send signed messages to people that aren't familiar with GnuPG, it's
992nice to also include a link to this guide in your standard email signature
993(the text kind, not the cryptographic kind).</p>
994
995</div><!-- End .main -->
7b83f7f9 996</div><!-- End #step-6a .step -->
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997
998<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 999<div id="step-6b" class="step">
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1000<div class="sidebar">
1001
69e314de 1002<p class="medium"><img
1805f65d 1003src="../static/img/en/screenshots/section6-02-use-it-well.png"
7b83f7f9 1004alt="Section 6: Use it Well (2)" /></p>
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1005
1006</div><!-- /.sidebar -->
1007<div class="main">
1008
1009<h3>Be wary of invalid keys</h3>
1010
1011<p>GnuPG makes email safer, but it's still important to watch out for invalid
1012keys, which might have fallen into the wrong hands. Email encrypted with
1013invalid keys might be readable by surveillance programs.</p>
1014
1015<p>In your email program, go back to the first encrypted email that Edward
1016sent you. Because Edward encrypted it with your public key, it will have a
80b64e11 1017green checkmark a at the top "OpenPGP" button.</p>
19bce4d7 1018
77aea16c 1019<p><strong>When using GnuPG, make a habit of glancing at that button. The program
4227f3fd 1020will warn you there if you get an email signed with a key that can't
77aea16c 1021be trusted.</strong></p>
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1022
1023</div><!-- End .main -->
7b83f7f9 1024</div><!-- End #step-6b .step -->
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1025
1026<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 1027<div id="step-6c" class="step">
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1028<div class="main">
1029
1030<h3>Copy your revocation certificate to somewhere safe</h3>
1031
1032<p>Remember when you created your keys and saved the revocation certificate
80b64e11 1033that 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>
19bce4d7
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1034
1035<p>If your private key ever gets lost or stolen, you'll need this certificate
1036file to let people know that you are no longer using that keypair.</p>
1037
1038</div><!-- End .main -->
7b83f7f9 1039</div><!-- End #step-6c .step -->
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1040
1041<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
1042<div id="step-lost_key" class="step">
1043<div class="main">
1044
b7f7b4a2 1045<h3><em>IMPORTANT:</em> ACT SWIFTLY if someone gets your private key</h3>
19bce4d7 1046
b7f7b4a2 1047<p>If you lose your private key or someone else gets a hold
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1048of it (say, by stealing or cracking your computer), it's
1049important to revoke it immediately before someone else uses
1050it to read your encrypted email or forge your signature. This
1051guide doesn't cover how to revoke a key, but you can follow these <a
1052href="https://www.hackdiary.com/2004/01/18/revoking-a-gpg-key/">instructions</a>.
1053After you're done revoking, make a new key and send an email to everyone
1054with whom you usually use your key to make sure they know, including a copy
1055of your new key.</p>
1056
1057</div><!-- End .main -->
1058</div><!-- End #step-lost_key .step-->
1059
35f08087 1060<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
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1061<div id="webmail-and-GnuPG" class="step">
1062<div class="main">
1063
1064<h3>Webmail and GnuPG</h3>
1065
1066<p>When you use a web browser to access your email, you're using webmail,
1067an email program stored on a distant website. Unlike webmail, your desktop
1068email program runs on your own computer. Although webmail can't decrypt
1069encrypted email, it will still display it in its encrypted form. If you
1070primarily use webmail, you'll know to open your email client when you receive
1071a scrambled email.</p>
1072
1073</div><!-- End .main -->
1074</div><!-- End #webmail-and-GnuPG .step-->
1075
35f08087 1076<!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
7b83f7f9 1077<div id="step-6d" class="step">
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1078<div class="main">
1079
1080<h3>Make your public key part of your online identity</h3>
1081
1082<p> First add your public key fingerprint to your email signature, then
1083compose an email to at least five of your friends, telling them you just
1084set up GnuPG and mentioning your public key fingerprint. Link to this guide
1085and ask them to join you. Don't forget that there's also an awesome <a
1086href="infographic.html">infographic to share.</a></p>
1087
1088<p class="notes">Start writing your public key fingerprint anywhere someone
1089would see your email address: your social media profiles, blog, Website,
1090or business card. (At the Free Software Foundation, we put ours on our
1091<a href="https://fsf.org/about/staff">staff page</a>.) We need to get our
1092culture to the point that we feel like something is missing when we see an
1093email address without a public key fingerprint.</p>
1094
35f08087 1095</div><!-- End .main-->
1096</div><!-- End #step-6d .step-->
7b83f7f9 1097</div></section><!-- End #section6 -->
19bce4d7 1098
7b83f7f9 1099<!-- ~~~~~~~~~ Section 7: Next steps ~~~~~~~~~ -->
b7f7b4a2 1100<section class="row" id="section7">
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1101<div id="step-click_here" class="step">
1102<div class="main">
0a225228 1103
19bce4d7 1104<h2><a href="next_steps.html">Great job! Check out the next steps.</a></h2>
bb28ee32 1105
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1106</div><!-- End .main -->
1107</div><!-- End #step-click_here .step-->
7b83f7f9 1108</section><!-- End #section7 -->
bdf319c4 1109
19bce4d7 1110<!-- ~~~~~~~~~ FAQ ~~~~~~~~~ -->
f44dd62f 1111<!-- When un-commenting this section go to main.css and search
116f80c3 1112for /* Guide Sections Background */ then add #faq to the desired color
19bce4d7 1113<section class="row" id="faq"><div>
116f80c3 1114<div class="sidebar">
19bce4d7 1115
116f80c3 1116<h2>FAQ</h2>
6c495e2d 1117
19bce4d7 1118</div>
116f80c3 1119<div class="main">
19bce4d7 1120
116f80c3
ZR
1121<dl>
1122<dt>My key expired</dt>
1123<dd>Answer coming soon.</dd>
6c495e2d 1124
116f80c3
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1125<dt>Who can read encrypted messages? Who can read signed ones?</dt>
1126<dd>Answer coming soon.</dd>
6c495e2d 1127
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1128<dt>My email program is opening at times I don't want it to open/is now my
1129default program and I don't want it to be.</dt>
116f80c3
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1130<dd>Answer coming soon.</dd>
1131</dl>
19bce4d7 1132
116f80c3
ZR
1133</div>
1134</div>
1135</section> --><!-- End #faq -->
bdf319c4 1136
19bce4d7
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1137<!-- ~~~~~~~~~ Footer ~~~~~~~~~ -->
1138<footer class="row" id="footer"><div>
1139<div id="copyright">
1140
1141<h4><a href="https://u.fsf.org/ys"><img
1142alt="Free Software Foundation"
14c5f099 1143src="../static/img/fsf-logo.png" /></a></h4>
19bce4d7 1144
37d0bc33 1145<p>Copyright &copy; 2014-2021 <a
19bce4d7
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1146href="https://u.fsf.org/ys">Free Software Foundation</a>, Inc. <a
1147href="https://my.fsf.org/donate/privacypolicy.html">Privacy Policy</a>. Please
1148support our work by <a href="https://u.fsf.org/yr">joining us as an associate
1149member.</a></p>
1150
1151<p>The images on this page are under a <a
1152href="https://creativecommons.org/licenses/by/4.0/">Creative Commons
1153Attribution 4.0 license (or later version)</a>, and the rest of it is under
1154a <a href="https://creativecommons.org/licenses/by-sa/4.0">Creative Commons
1155Attribution-ShareAlike 4.0 license (or later version)</a>. Download the <a
6003a573 1156href="https://agpl.fsf.org/emailselfdefense.fsf.org/edward/CURRENT/edward.tar.gz">
f211d856 1157source code of Edward reply bot</a> by Andrew Engelbrecht
a3a9a0ac 1158&lt;andrew@engelbrecht.io&gt; and Josh Drake &lt;zamnedix@gnu.org&gt;,
19bce4d7 1159available under the GNU Affero General Public License. <a
6003a573 1160href="https://www.gnu.org/licenses/license-list.html#OtherLicenses">Why these
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1161licenses?</a></p>
1162
1163<p>Fonts used in the guide &amp; infographic: <a
1164href="https://www.google.com/fonts/specimen/Dosis">Dosis</a> by Pablo
6003a573 1165Impallari, <a href="https://www.google.com/fonts/specimen/Signika">Signika</a>
19bce4d7 1166by Anna Giedry&#347;, <a
6003a573 1167href="https://www.google.com/fonts/specimen/Archivo+Narrow">Archivo
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1168Narrow</a> by Omnibus-Type, <a
1169href="https://libreplanet.org/wiki/GPG_guide/Graphics_Howto#Pitfalls">PXL-2000</a>
1170by Florian Cramer.</p>
1171
1172<p>Download the <a href="emailselfdefense_source.zip">source package</a>
1173for this guide, including fonts, image source files and the text of Edward's
1174messages.</p>
1175
1176<p>This site uses the Weblabels standard for labeling <a
1177href="https://www.fsf.org/campaigns/freejs">free JavaScript</a>. View
abf30801 1178the JavaScript <a href="https://weblabels.fsf.org/emailselfdefense.fsf.org/"
19bce4d7
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1179rel="jslicense">source code and license information</a>.</p>
1180
1181</div><!-- /#copyright -->
1182
1183<p class="credits">Infographic and guide design by <a rel="external"
6003a573 1184href="https://jplusplus.org"><strong>Journalism++</strong><img
138192ae 1185src="static/img/jplusplus.png"
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1186alt="Journalism++" /></a></p><!-- /.credits -->
1187</div></footer><!-- End #footer -->
116f80c3 1188
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1197 var _paq = _paq || [];
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