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5 <title>Email Self-Defense - a guide to fighting surveillance with GnuPG
6 encryption</title>
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8 email, Enigmail" />
9 <meta name="description" content="Email surveillance violates our fundamental
10 rights and makes free speech risky. This guide will teach you email
11 self-defense in 40 minutes with GnuPG." />
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22 <!-- ~~~~~~~~~ GnuPG Header and introduction text ~~~~~~~~~ -->
23 <header class="row" id="header"><div>
24
25 <h1>Email Self-Defense</h1>
26
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50 <li class="spacer"><a href="index.html" class="current">GNU/Linux</a></li>
51 <li><a href="mac.html">Mac OS</a></li>
52 <li><a href="windows.html">Windows</a></li>
53 <li class="spacer"><a href="workshops.html">Teach your friends</a></li>
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67 <!-- ~~~~~~~~~ FSF Introduction ~~~~~~~~~ -->
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69
70 <h3><a href="http://u.fsf.org/ys"><img
71 alt="Free Software Foundation"
72 src="//static.fsf.org/nosvn/enc-dev0/img/fsf-logo.png" />
73 </a></h3>
74
75 <div class="fsf-emphasis">
76
77 <p>We fight for computer users' rights, and promote the development of free (as
78 in freedom) software. Resisting bulk surveillance is very important to us.</p>
79
80 <p><strong>Please donate to support Email Self-Defense. We need to keep
81 improving it, and making more materials, for the benefit of people around
82 the world taking the first step towards protecting their privacy.</strong></p>
83
84 </div>
85
86 <p><a
87 href="https://crm.fsf.org/civicrm/contribute/transact?reset=1&amp;id=14&amp;pk_campaign=email_self_defense&amp;pk_kwd=guide_donate"><img
88 alt="Donate"
89 src="//static.fsf.org/nosvn/enc-dev0/img/en/donate.png" /></a></p>
90
91 </div><!-- End #fsf-intro -->
92
93 <!-- ~~~~~~~~~ Guide Introduction ~~~~~~~~~ -->
94 <div class="intro">
95
96 <p><a id="infographic" href="infographic.html"><img
97 src="//static.fsf.org/nosvn/enc-dev0/img/en/infographic-button.png"
98 alt="View &amp; share our infographic &rarr;" /></a>
99 Bulk surveillance violates our fundamental rights and makes free speech
100 risky. This guide will teach you a basic surveillance self-defense skill: email
101 encryption. Once you've finished, you'll be able to send and receive emails
102 that are scrambled to make sure a surveillance agent or thief intercepting
103 your email can't read them. All you need is a computer with an Internet
104 connection, an email account, and about forty minutes.</p>
105
106 <p>Even if you have nothing to hide, using encryption helps protect the privacy
107 of people you communicate with, and makes life difficult for bulk surveillance
108 systems. If you do have something important to hide, you're in good company;
109 these are the same tools that whistleblowers use to protect their identities
110 while shining light on human rights abuses, corruption and other crimes.</p>
111
112 <p>In addition to using encryption, standing up
113 to surveillance requires fighting politically for a <a
114 href="http://gnu.org/philosophy/surveillance-vs-democracy.html">reduction
115 in the amount of data collected on us</a>, but the essential first step is
116 to protect yourself and make surveillance of your communication as difficult
117 as possible. This guide helps you do that. It is designed for beginners, but
118 if you already know the basics of GnuPG or are an experienced free software
119 user, you'll enjoy the advanced tips and the <a href="workshops.html">guide
120 to teaching your friends</a>.</p>
121
122 </div><!-- End .intro -->
123 </div></header><!-- End #header -->
124
125 <!-- ~~~~~~~~~ Section 1: Get the pieces ~~~~~~~~~ -->
126 <section class="row" id="section1"><div>
127
128 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
129 <div class="section-intro">
130
131 <h2><em>#1</em> Get the pieces</h2>
132
133 <p class="notes">This guide relies on software which is <a
134 href="https://www.gnu.org/philosophy/free-sw.html">freely licensed</a>;
135 it's completely transparent and anyone can copy it or make their
136 own version. This makes it safer from surveillance than proprietary
137 software (like Windows). Learn more about free software at <a
138 href="https://u.fsf.org/ys">fsf.org</a>.</p>
139
140 <p>Most GNU/Linux operating systems come with GnuPG installed on them,
141 so you don't have to download it. Before configuring GnuPG though, you'll
142 need the IceDove desktop email program installed on your computer. Most
143 GNU/Linux distributions have IceDove installed already, though it may be
144 under the alternate name "Thunderbird." Email programs are another way to
145 access the same email accounts you can access in a browser (like Gmail),
146 but provide extra features.</p>
147
148 <p>If you already have an email program, you can skip to <a
149 href="#step-1b">Step 1.b</a>.</p>
150
151 </div><!-- End .section-intro -->
152
153 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
154 <div id="step-1a" class="step">
155 <div class="sidebar">
156
157 <p><img
158 src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1a-install-wizard.png"
159 alt="Step 1.A: Install Wizard" /></p>
160
161 </div><!-- /.sidebar -->
162 <div class="main">
163
164 <h3><em>Step 1.a</em> Set up your email program with your email account</h3>
165
166 <p>Open your email program and follow the wizard (step-by-step walkthrough)
167 that sets it up with your email account.</p>
168
169 <p>Look for the letters SSL, TLS, or STARTTLS to the right of the servers
170 when you're setting up your account. If you don't see them, you will still
171 be able to use encryption, but this means that the people running your email
172 system are running behind the industry standard in protecting your security
173 and privacy. We recommend that you send them a friendly email asking them
174 to enable SSL, TLS, or STARTTLS for your email server. They will know what
175 you're talking about, so it's worth making the request even if you aren't
176 an expert on these security systems.</p>
177
178 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
179 <div class="troubleshooting">
180
181 <h4>Troubleshooting</h4>
182
183 <dl>
184 <dt>The wizard doesn't launch</dt>
185 <dd>You can launch the wizard yourself, but the menu option for doing so is
186 named differently in each email program. The button to launch it will be in
187 the program's main menu, under "New" or something similar, titled something
188 like "Add account" or "New/Existing email account."</dd>
189
190 <dt>The wizard can't find my account or isn't downloading my mail</dt>
191 <dd>Before searching the Web, we recommend you start by asking other people
192 who use your email system, to figure out the correct settings.</dd>
193
194 <dt class="feedback">Don't see a solution to your problem?</dt>
195 <dd class="feedback">Please let us know on the <a
196 href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
197 page</a>.</dd>
198 </dl>
199
200 </div><!-- /.troubleshooting -->
201 </div><!-- End .main -->
202 </div><!-- End #step1-a .step -->
203
204 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
205 <div id="step-1b" class="step">
206 <div class="sidebar">
207 <ul class="images">
208 <li><img src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1b-01-tools-addons.png"
209 alt="Step 1.B: Tools -> Add-ons" /></li>
210 <li><img src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1b-02-search.png"
211 alt="Step 1.B: Search Add-ons" /></li>
212 <li><img src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1b-03-install.png"
213 alt="Step 1.B: Install Add-ons" /></li>
214 </ul>
215
216 </div><!-- /.sidebar -->
217 <div class="main">
218
219 <h3><em>Step 1.b</em> Install the Enigmail plugin for your email program</h3>
220
221 <p>In your email program's menu, select Add-ons (it may be in the Tools
222 section). Make sure Extensions is selected on the left. Do you see Enigmail?
223 Make sure it's the latest version. If so, skip this step.</p>
224
225 <p>If not, search "Enigmail" with the search bar in the upper right. You
226 can take it from here. Restart your email program when you're done.</p>
227
228 <p>There are major security flaws in versions of GnuPG prior to 2.2.8, and
229 Enigmail prior to 2.0.7. Make sure you have GnuPG 2.2.8 and Enigmail 2.0.7,
230 or later versions.</p>
231
232 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
233 <div class="troubleshooting">
234
235 <h4>Troubleshooting</h4>
236
237 <dl>
238 <dt>I can't find the menu.</dt>
239 <dd>In many new email programs, the main menu is represented by an image of
240 three stacked horizontal bars.</dd>
241
242 <dt>My email looks weird</dt>
243 <dd>Enigmail doesn't tend to play nice with HTML, which is used to format
244 emails, so it may disable your HTML formatting automatically. To send an
245 HTML-formatted email without encryption or a signature, hold down the Shift
246 key when you select compose. You can then write an email as if Enigmail
247 wasn't there.</dd>
248
249 <dt class="feedback">Don't see a solution to your problem?</dt>
250 <dd class="feedback">Please let us know on the <a
251 href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
252 page</a>.</dd>
253 </dl>
254
255 </div><!-- /.troubleshooting -->
256 </div><!-- End .main -->
257 </div><!-- End #step-1b .step -->
258 </div></section><!-- End #section1 -->
259
260 <!-- ~~~~~~~~~ Section 2: Make your keys ~~~~~~~~~ -->
261 <section class="row" id="section2"><div>
262
263 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
264 <div class="section-intro">
265
266 <h2><em>#2</em> Make your keys</h2>
267
268 <p>To use the GnuPG system, you'll need a public key and a private key (known
269 together as a keypair). Each is a long string of randomly generated numbers
270 and letters that are unique to you. Your public and private keys are linked
271 together by a special mathematical function.</p>
272
273 <p>Your public key isn't like a physical key, because it's stored in the open
274 in an online directory called a keyserver. People download it and use it,
275 along with GnuPG, to encrypt emails they send to you. You can think of the
276 keyserver as a phonebook; people who want to send you encrypted email can
277 look up your public key.</p>
278
279 <p>Your private key is more like a physical key, because you keep it to
280 yourself (on your computer). You use GnuPG and your private key together to
281 descramble encrypted emails other people send to you. <span style="font-weight:
282 bold;">You should never share your private key with anyone, under any
283 circumstances.</span></p>
284
285 <p>In addition to encryption and decryption, you can also use these keys to
286 sign messages and check the authenticity of other people's signatures. We'll
287 discuss this more in the next section.</p>
288
289 </div><!-- End .section-intro -->
290
291 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
292 <div id="step-2a" class="step">
293 <div class="sidebar">
294
295 <p><img
296 src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step2a-01-make-keypair.png"
297 alt="Step 2.A: Make a Keypair" /></p>
298
299 </div><!-- /.sidebar -->
300 <div class="main">
301
302 <h3><em>Step 2.a</em> Make a keypair</h3>
303
304 <p>The Enigmail Setup wizard may start automatically. If it doesn't, select
305 Enigmail &rarr; Setup Wizard from your email program's menu. You don't need
306 to read the text in the window that pops up unless you'd like to, but it's
307 good to read the text on the later screens of the wizard. Click Next with
308 the default options selected, except in these instances, which are listed
309 in the order they appear:</p>
310
311 <ul>
312 <li>On the screen titled "Encryption," select "Encrypt all of my messages
313 by default, because privacy is critical to me."</li>
314
315 <li>On the screen titled "Signing," select "Don't sign my messages by
316 default."</li>
317
318 <li>On the screen titled "Key Selection," select "I want to create a new
319 key pair for signing and encrypting my email."</li>
320
321 <li>On the screen titled "Create Key," pick a strong password! You can
322 do it manually, or you can use the Diceware method. Doing it manually
323 is faster but not as secure. Using Diceware takes longer and requires
324 dice, but creates a password that is much harder for attackers to figure
325 out. To use it, read the section "Make a secure passphrase with Diceware" in <a
326 href="https://theintercept.com/2015/03/26/passphrases-can-memorize-attackers-cant-guess/">
327 this article</a> by Micah Lee.</li>
328 </ul>
329
330 <p>If you'd like to pick a password manually, come up with something
331 you can remember which is at least twelve characters long, and includes
332 at least one lower case and upper case letter and at least one number or
333 punctuation symbol. Never pick a password you've used elsewhere. Don't use
334 any recognizable patterns, such as birthdays, telephone numbers, pets' names,
335 song lyrics, quotes from books, and so on.</p>
336
337 <p class="notes">The program will take a little while to finish the next
338 step, the "Key Creation" screen. While you wait, do something else with your
339 computer, like watching a movie or browsing the Web. The more you use the
340 computer at this point, the faster the key creation will go.</p>
341
342 <p><span style="font-weight: bold;">When the "Key Generation Completed" screen
343 pops up, select Generate Certificate and choose to save it in a safe place on
344 your computer (we recommend making a folder called "Revocation Certificate"
345 in your home folder and keeping it there). This step is essential for your
346 email self-defense, as you'll learn more about in <a href="#section5">Section
347 5</a>.</span></p>
348
349 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
350 <div class="troubleshooting">
351
352 <h4>Troubleshooting</h4>
353
354 <dl>
355 <dt>I can't find the Enigmail menu.</dt>
356 <dd>In many new email programs, the main menu is represented by an image
357 of three stacked horizontal bars. Enigmail may be inside a section called
358 Tools.</dd>
359
360 <dt>The wizard says that it cannot find GnuPG.</dt>
361 <dd>Open whatever program you usually use for installing software, and search
362 for GnuPG, then install it. Then restart the Enigmail setup wizard by going
363 to Enigmail &rarr; Setup Wizard.</dd>
364
365 <dt>More resources</dt>
366 <dd>If you're having trouble with our
367 instructions or just want to learn more, check out <a
368 href="https://www.enigmail.net/documentation/Key_Management#Generating_your_own_key_pair">
369 Enigmail's wiki instructions for key generation</a>.</dd>
370
371 <dt class="feedback">Don't see a solution to your problem?</dt>
372 <dd class="feedback">Please let us know on the <a
373 href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
374 page</a>.</dd>
375 </dl>
376
377 </div><!-- /.troubleshooting -->
378
379 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
380 <div class="troubleshooting">
381
382 <h4>Advanced</h4>
383
384 <dl>
385 <dt>Command line key generation</dt>
386 <dd>If you prefer using the command line for a higher
387 degree of control, you can follow the documentation from <a
388 href="https://www.gnupg.org/gph/en/manual/c14.html#AEN25">The GNU Privacy
389 Handbook</a>. Make sure you stick with "RSA and RSA" (the default),
390 because it's newer and more secure than the algorithms the documentation
391 recommends. Also make sure your key is at least 2048 bits, or 4096 if you
392 want to be extra secure.</dd>
393
394 <dt>Advanced key pairs</dt>
395 <dd>When GnuPG creates a new keypair, it compartmentalizes
396 the encryption function from the signing function through <a
397 href="https://wiki.debian.org/Subkeys">subkeys</a>. If you use
398 subkeys carefully, you can keep your GnuPG identity much more
399 secure and recover from a compromised key much more quickly. <a
400 href="https://alexcabal.com/creating-the-perfect-gpg-keypair/">Alex Cabal</a>
401 and <a href="http://keyring.debian.org/creating-key.html">the Debian wiki</a>
402 provide good guides for setting up a secure subkey configuration.</dd>
403 </dl>
404
405 </div><!-- /.troubleshooting -->
406 </div><!-- End .main -->
407 </div><!-- End #step-2a .step -->
408
409 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
410 <div id="step-2b" class="step">
411 <div class="main">
412
413 <h3><em>Step 2.b</em> Upload your public key to a keyserver</h3>
414
415 <p>In your email program's menu, select Enigmail &rarr; Key Management.</p>
416
417 <p>Right click on your key and select Upload Public Keys to Keyserver. You
418 don't have to use the default keyserver. If, after research, you would like
419 to change to a different default keyserver, you can change that setting
420 manually in the Enigmail preferences.</p>
421
422 <p class="notes">Now someone who wants to send you an encrypted message can
423 download your public key from the Internet. There are multiple keyservers
424 that you can select from the menu when you upload, but they are all copies
425 of each other, so it doesn't matter which one you use. However, it sometimes
426 takes a few hours for them to match each other when a new key is uploaded.</p>
427
428 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
429 <div class="troubleshooting">
430
431 <h4>Troubleshooting</h4>
432
433 <dl>
434 <dt>The progress bar never finishes</dt>
435 <dd>Close the upload popup, make sure you are connected to the Internet,
436 and try again. If that doesn't work, try again, selecting a different
437 keyserver.</dd>
438
439 <dt>My key doesn't appear in the list</dt>
440 <dd>Try checking "Display All Keys by Default."</dd>
441
442 <dt>More documentation</dt>
443 <dd>If you're having trouble with our
444 instructions or just want to learn more, check out <a
445 href="https://www.enigmail.net/documentation/Key_Management#Distributing_your_public_key">
446 Enigmail's documentation</a>.</dd>
447
448 <dt class="feedback">Don't see a solution to your problem?</dt>
449 <dd class="feedback">Please let us know on the <a
450 href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
451 page</a>.</dd>
452 </dl>
453
454 </div><!-- /.troubleshooting -->
455
456 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
457 <div class="troubleshooting">
458
459 <h4>Advanced</h4>
460
461 <dl>
462 <dt>Uploading a key from the command line</dt>
463 <dd>You can also upload your keys to a keyserver through the <a
464 href="https://www.gnupg.org/gph/en/manual/x457.html">command line</a>. <a
465 href="https://sks-keyservers.net/overview-of-pools.php">The sks Web site</a>
466 maintains a list of highly interconnected keyservers. You can also <a
467 href="https://www.gnupg.org/gph/en/manual/x56.html#AEN64">directly export
468 your key</a> as a file on your computer.</dd>
469 </dl>
470
471 </div><!-- /.troubleshooting -->
472 </div><!-- End .main -->
473 </div><!-- End #step-2b .step -->
474
475 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
476 <div id="terminology" class="step">
477 <div class="main">
478
479 <h3>GnuPG, OpenPGP, what?</h3>
480
481 <p>In general, the terms GnuPG, GPG, GNU Privacy Guard, OpenPGP and PGP
482 are used interchangeably. Technically, OpenPGP (Pretty Good Privacy) is the
483 encryption standard, and GNU Privacy Guard (often shortened to GPG or GnuPG)
484 is the program that implements the standard. Enigmail is a plug-in program
485 for your email program that provides an interface for GnuPG.</p>
486
487 </div><!-- End .main -->
488 </div><!-- End #terminology.step-->
489 </div></section><!-- End #section2 -->
490
491 <!-- ~~~~~~~~~ Section 3: Try it out ~~~~~~~~~ -->
492 <section class="row" id="section3"><div>
493
494 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
495 <div class="section-intro">
496
497 <h2><em>#3</em> Try it out!</h2>
498
499 <p>Now you'll try a test correspondence with a computer program named Edward,
500 who knows how to use encryption. Except where noted, these are the same
501 steps you'd follow when corresponding with a real, live person.</p>
502
503 <!-- <p>NOTE: Edward is currently having some technical difficulties, so he
504 may take a long time to respond, or not respond at all. We're sorry about
505 this and we're working hard to fix it. Your key will still work even without
506 testing with Edward.</p> -->
507 </div><!-- End .section-intro -->
508
509 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
510 <div id="step-3a" class="step">
511 <div class="sidebar">
512
513 <p><img
514 src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section3-try-it-out.png"
515 alt="Try it out." /></p>
516
517 </div><!-- /.sidebar -->
518 <div class="main">
519
520 <h3><em>Step 3.a</em> Send Edward your public key</h3>
521
522 <p>This is a special step that you won't have to do when corresponding
523 with real people. In your email program's menu, go to Enigmail &rarr; Key
524 Management. You should see your key in the list that pops up. Right click
525 on your key and select Send Public Keys by Email. This will create a new
526 draft message, as if you had just hit the Write button.</p>
527
528 <p>Address the message to <a
529 href="mailto:edward-en@fsf.org">edward-en@fsf.org</a>. Put at least one word
530 (whatever you want) in the subject and body of the email. Don't send yet.</p>
531
532 <p>The lock icon in the top left should be yellow, meaning encryption is
533 turned on. We want this first special message to be unencrypted, so
534 click the icon once to turn it off. The lock should become grey, with a
535 blue dot on it (to alert you that the setting has been changed from the
536 default). Once encryption is off, hit Send.</p>
537
538 <p class="notes">It may take two or three minutes for Edward to
539 respond. In the meantime, you might want to skip ahead and check out the <a
540 href="#section5">Use it Well</a> section of this guide. Once he's responded,
541 head to the next step. From here on, you'll be doing just the same thing as
542 when corresponding with a real person.</p>
543
544 <p>When you open Edward's reply, GnuPG may prompt you for your password
545 before using your private key to decrypt it.</p>
546
547 </div><!-- End .main -->
548 </div><!-- End #step-3a .step -->
549
550 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
551 <div id="step-3b" class="step">
552 <div class="main">
553
554 <h3><em>Step 3.b</em> Send a test encrypted email</h3>
555
556 <p>Write a new email in your email program, addressed to <a
557 href="mailto:edward-en@fsf.org">edward-en@fsf.org</a>. Make the subject
558 "Encryption test" or something similar and write something in the body.</p>
559
560 <p>The lock icon in the top left of the window should be yellow, meaning
561 encryption is on. This will be your default from now on.</p>
562
563 <p class="notes">Next to the lock, you'll notice an icon of a pencil. We'll
564 get to this in a moment.</p>
565
566 <p>Click Send. Enigmail will pop up a window that says "Recipients not valid,
567 not trusted or not found."</p>
568
569 <p>To encrypt an email to Edward, you need his public key, so now you'll have
570 Enigmail download it from a keyserver. Click Download Missing Keys and use
571 the default in the pop-up that asks you to choose a keyserver. Once it finds
572 keys, check the first one (Key ID starting with C), then select ok. Select
573 ok in the next pop-up.</p>
574
575 <p>Now you are back at the "Recipients not valid, not trusted or not found"
576 screen. Check the box in front of Edward's key and click Send.</p>
577
578 <p class="notes">Since you encrypted this email with Edward's public key,
579 Edward's private key is required to decrypt it. Edward is the only one with
580 his private key, so no one except him can decrypt it.</p>
581
582 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
583 <div class="troubleshooting">
584
585 <h4>Troubleshooting</h4>
586
587 <dl>
588 <dt>Enigmail can't find Edward's key</dt>
589 <dd>Close the pop-ups that have appeared since you clicked Send. Make sure
590 you are connected to the Internet and try again. If that doesn't work, repeat
591 the process, choosing a different keyserver when it asks you to pick one.</dd>
592
593 <dt>Unscrambled messages in the Sent folder</dt>
594 <dd>Even though you can't decrypt messages encrypted to someone else's key,
595 your email program will automatically save a copy encrypted to your public key,
596 which you'll be able to view from the Sent folder like a normal email. This
597 is normal, and it doesn't mean that your email was not sent encrypted.</dd>
598
599 <dt>More resources</dt>
600 <dd>If you're still having trouble with our
601 instructions or just want to learn more, check out <a
602 href="https://www.enigmail.net/documentation/Signature_and_Encryption#Encrypting_a_message">
603 Enigmail's wiki</a>.</dd>
604
605 <dt class="feedback">Don't see a solution to your problem?</dt>
606 <dd class="feedback">Please let us know on the <a
607 href="https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
608 page</a>.</dd>
609 </dl>
610
611 </div><!-- /.troubleshooting -->
612
613 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
614 <div class="troubleshooting">
615
616 <h4>Advanced</h4>
617
618 <dl>
619 <dt>Encrypt messages from the command line</dt>
620 <dd>You can also encrypt and decrypt messages and files from the <a
621 href="https://www.gnupg.org/gph/en/manual/x110.html">command line</a>,
622 if that's your preference. The option --armor makes the encrypted output
623 appear in the regular character set.</dd>
624 </dl>
625
626 </div><!-- /.troubleshooting -->
627 </div><!-- End .main -->
628 </div><!-- End #step-3b .step -->
629
630 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
631 <div id="step-headers_unencrypted" class="step">
632 <div class="main">
633
634 <h3><em>Important:</em> Security tips</h3>
635
636 <p>Even if you encrypt your email, the subject line is not encrypted, so
637 don't put private information there. The sending and receiving addresses
638 aren't encrypted either, so a surveillance system can still figure out who
639 you're communicating with. Also, surveillance agents will know that you're
640 using GnuPG, even if they can't figure out what you're saying. When you
641 send attachments, Enigmail will give you the choice to encrypt them or not,
642 independent of the actual email.</p>
643
644 <p>For greater security against potential attacks, you can turn off
645 HTML. Instead, you can render the message body as plain text. In order
646 to do this in Thunderbird, go to View &gt; Message Body As &gt; Plain
647 Text.</p>
648
649 </div><!-- End .main -->
650 </div><!-- End #step-headers_unencrypted .step-->
651
652 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
653 <div id="step-3c" class="step">
654 <div class="main">
655
656 <h3><em>Step 3.c</em> Receive a response</h3>
657
658 <p>When Edward receives your email, he will use his private key to decrypt
659 it, then reply to you. </p>
660
661 <p class="notes">It may take two or three minutes for Edward to
662 respond. In the meantime, you might want to skip ahead and check out the <a
663 href="#section5">Use it Well</a> section of this guide.</p>
664
665 </div><!-- End .main -->
666 </div><!-- End #step-3c .step -->
667
668 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
669 <div id="step-3d" class="step">
670 <div class="main">
671
672 <h3><em>Step 3.d</em> Send a test signed email</h3>
673
674 <p>GnuPG includes a way for you to sign messages and files, verifying that
675 they came from you and that they weren't tampered with along the way. These
676 signatures are stronger than their pen-and-paper cousins -- they're impossible
677 to forge, because they're impossible to create without your private key
678 (another reason to keep your private key safe).</p>
679
680 <p>You can sign messages to anyone, so it's a great way to make people
681 aware that you use GnuPG and that they can communicate with you securely. If
682 they don't have GnuPG, they will be able to read your message and see your
683 signature. If they do have GnuPG, they'll also be able to verify that your
684 signature is authentic.</p>
685
686 <p>To sign an email to Edward, compose any message to him and click the
687 pencil icon next to the lock icon so that it turns gold. If you sign a
688 message, GnuPG may ask you for your password before it sends the message,
689 because it needs to unlock your private key for signing.</p>
690
691 <p>With the lock and pencil icons, you can choose whether each message will
692 be encrypted, signed, both, or neither.</p>
693
694 </div>
695 </div>
696
697 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
698 <div id="step-3e" class="step">
699 <div class="main">
700
701 <h3><em>Step 3.e</em> Receive a response</h3>
702
703 <p>When Edward receives your email, he will use your public key (which
704 you sent him in <a href="#step-3a">Step 3.A</a>) to verify the message
705 you sent has not been tampered with and to encrypt his reply to you.</p>
706
707 <p class="notes">It may take two or three minutes for Edward to
708 respond. In the meantime, you might want to skip ahead and check out the <a
709 href="#section5">Use it Well</a> section of this guide.</p>
710
711 <p>Edward's reply will arrive encrypted, because he prefers to use encryption
712 whenever possible. If everything goes according to plan, it should say
713 "Your signature was verified." If your test signed email was also encrypted,
714 he will mention that first.</p>
715
716 <p>When you receive Edward's email and open it, Enigmail will
717 automatically detect that it is encrypted with your public key, and
718 then it will use your private key to decrypt it.</p>
719
720 <p>Notice the bar that Enigmail shows you above the message, with
721 information about the status of Edward's key.</p>
722
723 </div><!-- End .main -->
724 </div><!-- End #step-3e .step -->
725 </div></section>
726
727 <!-- ~~~~~~~~~ Section 4: Learn the Web of Trust ~~~~~~~~~ -->
728 <section class="row" id="section4"><div>
729
730 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
731 <div class="section-intro">
732
733 <h2><em>#4</em> Learn the Web of Trust</h2>
734
735 <p>Email encryption is a powerful technology, but it has a weakness;
736 it requires a way to verify that a person's public key is actually
737 theirs. Otherwise, there would be no way to stop an attacker from making
738 an email address with your friend's name, creating keys to go with it and
739 impersonating your friend. That's why the free software programmers that
740 developed email encryption created keysigning and the Web of Trust.</p>
741
742 <p>When you sign someone's key, you are publicly saying that you've verified
743 that it belongs to them and not someone else.</p>
744
745 <p>Signing keys and signing messages use the same type of mathematical
746 operation, but they carry very different implications. It's a good practice
747 to generally sign your email, but if you casually sign people's keys, you
748 may accidently end up vouching for the identity of an imposter.</p>
749
750 <p>People who use your public key can see who has signed it. Once you've
751 used GnuPG for a long time, your key may have hundreds of signatures. You
752 can consider a key to be more trustworthy if it has many signatures from
753 people that you trust. The Web of Trust is a constellation of GnuPG users,
754 connected to each other by chains of trust expressed through signatures.</p>
755
756 </div><!-- End .section-intro -->
757
758 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
759 <div id="step-4a" class="step">
760 <div class="sidebar">
761
762 <p><img
763 src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section4-web-of-trust.png"
764 alt="Section 4: Web of Trust" /></p>
765
766 </div><!-- /.sidebar -->
767 <div class="main">
768
769 <h3><em>Step 4.a</em> Sign a key</h3>
770
771 <p>In your email program's menu, go to Enigmail &rarr; Key Management.</p>
772
773 <p>Right click on Edward's public key and select Sign Key from the context
774 menu.</p>
775
776 <p>In the window that pops up, select "I will not answer" and click ok.</p>
777
778 <p>Now you should be back at the Key Management menu. Select Keyserver &rarr;
779 Upload Public Keys and hit ok.</p>
780
781 <p class="notes">You've just effectively said "I trust that Edward's public
782 key actually belongs to Edward." This doesn't mean much because Edward isn't
783 a real person, but it's good practice.</p>
784
785 <!--<div id="pgp-pathfinder">
786
787 <form enctype="application/x-www-form-urlencoded" action="/mk_path.cgi"
788 method="get">
789
790 <p><strong>From:</strong><input type="text" value="xD41A008"
791 name="FROM"></p>
792
793 <p><strong>To:</strong><input type="text" value="50BD01x4" name="TO"></p>
794
795 <p class="buttons"><input type="submit" value="trust paths" name="PATHS"><input
796 type="reset" value="reset" name=".reset"></p>
797
798 </form>
799
800 </div>End #pgp-pathfinder -->
801 </div><!-- End .main -->
802 </div><!-- End #step-4a .step -->
803
804 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
805 <div id="step-identify_keys" class="step">
806 <div class="main">
807
808 <h3>Identifying keys: Fingerprints and IDs</h3>
809
810 <p>People's public keys are usually identified by their key fingerprint,
811 which is a string of digits like F357AA1A5B1FA42CFD9FE52A9FF2194CC09A61E8
812 (for Edward's key). You can see the fingerprint for your public key, and
813 other public keys saved on your computer, by going to Enigmail &rarr; Key
814 Management in your email program's menu, then right clicking on the key
815 and choosing Key Properties. It's good practice to share your fingerprint
816 wherever you share your email address, so that people can double-check that
817 they have the correct public key when they download yours from a keyserver.</p>
818
819 <p class="notes">You may also see public keys referred to by a shorter
820 key ID. This key ID is visible directly from the Key Management
821 window. These eight character key IDs were previously used for
822 identification, which used to be safe, but is no longer reliable. You
823 need to check the full fingerprint as part of verifying you have the
824 correct key for the person you are trying to contact. Spoofing, in
825 which someone intentionally generates a key with a fingerprint whose
826 final eight characters are the same as another, is unfortunately
827 common.</p>
828
829 </div><!-- End .main -->
830 </div><!-- End #step-identify_keys .step-->
831
832 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
833 <div id="check-ids-before-signing" class="step">
834 <div class="main">
835
836 <h3><em>Important:</em> What to consider when signing keys</h3>
837
838 <p>Before signing a person's key, you need to be confident that it actually
839 belongs to them, and that they are who they say they are. Ideally, this
840 confidence comes from having interactions and conversations with them over
841 time, and witnessing interactions between them and others. Whenever signing
842 a key, ask to see the full public key fingerprint, and not just the shorter
843 key ID. If you feel it's important to sign the key of someone you've just
844 met, also ask them to show you their government identification, and make
845 sure the name on the ID matches the name on the public key. In Enigmail,
846 answer honestly in the window that pops up and asks "How carefully have you
847 verified that the key you are about to sign actually belongs to the person(s)
848 named above?"</p>
849
850 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
851 <div class="troubleshooting">
852
853 <h4>Advanced</h4>
854
855 <dl>
856 <dt>Master the Web of Trust</dt>
857 <dd>Unfortunately, trust does not spread between users the way <a
858 href="http://fennetic.net/irc/finney.org/~hal/web_of_trust.html">many people
859 think</a>. One of best ways to strengthen the GnuPG community is to deeply <a
860 href="https://www.gnupg.org/gph/en/manual/x334.html">understand</a> the Web of
861 Trust and to carefully sign as many people's keys as circumstances permit.</dd>
862
863 <dt>Set ownertrust</dt>
864 <dd>If you trust someone enough to validate other people's keys, you can assign
865 them an ownertrust level through Enigmails's key management window. Right
866 click on the other person's key, go to the "Select Owner Trust" menu option,
867 select the trustlevel and click OK. Only do this once you feel you have a
868 deep understanding of the Web of Trust.</dd>
869 </dl>
870
871 </div><!-- /.troubleshooting -->
872 </div><!-- End .main -->
873 </div><!-- End #check-ids-before-signing .step-->
874 </div></section><!-- End #section4 -->
875
876 <!-- ~~~~~~~~~ Section 5: Use it well ~~~~~~~~~ -->
877 <section id="section5" class="row"><div>
878
879 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
880 <div class="section-intro">
881
882 <h2><em>#5</em> Use it well</h2>
883
884 <p>Everyone uses GnuPG a little differently, but it's important to follow
885 some basic practices to keep your email secure. Not following them, you
886 risk the privacy of the people you communicate with, as well as your own,
887 and damage the Web of Trust.</p>
888
889 </div><!-- End .section-intro -->
890
891 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
892 <div id="step-5a" class="step">
893 <div class="sidebar">
894
895 <p><img
896 src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section5-01-use-it-well.png"
897 alt="Section 5: Use it Well (1)" /></p>
898
899 </div><!-- /.sidebar -->
900 <div class="main">
901
902 <h3>When should I encrypt? When should I sign?</h3>
903
904 <p>The more you can encrypt your messages, the better. If you only encrypt
905 emails occasionally, each encrypted message could raise a red flag for
906 surveillance systems. If all or most of your email is encrypted, people
907 doing surveillance won't know where to start. That's not to say that only
908 encrypting some of your email isn't helpful -- it's a great start and it
909 makes bulk surveillance more difficult.</p>
910
911 <p>Unless you don't want to reveal your own identity (which requires other
912 protective measures), there's no reason not to sign every message, whether or
913 not you are encrypting. In addition to allowing those with GnuPG to verify
914 that the message came from you, signing is a non-intrusive way to remind
915 everyone that you use GnuPG and show support for secure communication. If you
916 often send signed messages to people that aren't familiar with GnuPG, it's
917 nice to also include a link to this guide in your standard email signature
918 (the text kind, not the cryptographic kind).</p>
919
920 </div><!-- End .main -->
921 </div><!-- End #step-5a .step -->
922
923 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
924 <div id="step-5b" class="step">
925 <div class="sidebar">
926
927 <p><img
928 src="//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section5-02-use-it-well.png"
929 alt="Section 5: Use it Well (2)" /></p>
930
931 </div><!-- /.sidebar -->
932 <div class="main">
933
934 <h3>Be wary of invalid keys</h3>
935
936 <p>GnuPG makes email safer, but it's still important to watch out for invalid
937 keys, which might have fallen into the wrong hands. Email encrypted with
938 invalid keys might be readable by surveillance programs.</p>
939
940 <p>In your email program, go back to the first encrypted email that Edward
941 sent you. Because Edward encrypted it with your public key, it will have a
942 message from Enigmail at the top, which most likely says "Enigmail: Part of
943 this message encrypted."</p>
944
945 <p><b>When using GnuPG, make a habit of glancing at that bar. The program
946 will warn you there if you get an email signed with a key that can't
947 be trusted.</b></p>
948
949 </div><!-- End .main -->
950 </div><!-- End #step-5b .step -->
951
952 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
953 <div id="step-5c" class="step">
954 <div class="main">
955
956 <h3>Copy your revocation certificate to somewhere safe</h3>
957
958 <p>Remember when you created your keys and saved the revocation certificate
959 that GnuPG made? It's time to copy that certificate onto the safest digital
960 storage that you have -- the ideal thing is a flash drive, disk, or hard
961 drive stored in a safe place in your home, not on a device you carry with
962 you regularly.</p>
963
964 <p>If your private key ever gets lost or stolen, you'll need this certificate
965 file to let people know that you are no longer using that keypair.</p>
966
967 </div><!-- End .main -->
968 </div><!-- End #step-5c .step -->
969
970 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
971 <div id="step-lost_key" class="step">
972 <div class="main">
973
974 <h3><em>Important:</em> act swiftly if someone gets your private key</h3>
975
976 <p>If you lose your private key or someone else gets ahold
977 of it (say, by stealing or cracking your computer), it's
978 important to revoke it immediately before someone else uses
979 it to read your encrypted email or forge your signature. This
980 guide doesn't cover how to revoke a key, but you can follow these <a
981 href="https://www.hackdiary.com/2004/01/18/revoking-a-gpg-key/">instructions</a>.
982 After you're done revoking, make a new key and send an email to everyone
983 with whom you usually use your key to make sure they know, including a copy
984 of your new key.</p>
985
986 </div><!-- End .main -->
987 </div><!-- End #step-lost_key .step-->
988
989 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
990 <!---<div id="transfer-key" class="step">
991 <div class="main">
992
993 <h3>Transferring you key</h3>
994
995 <p>You can use Enigmail's <a
996 href="https://www.enigmail.net/documentation/Key_Management">key management
997 window</a> to import and export keys. If you want to be able to read
998 your encrypted email on a different computer, you will need to export
999 your secret key from here. Be warned, if you transfer the key without <a
1000 href="https://help.ubuntu.com/community/EncryptedFilesystemsOnRemovableStorage">encrypting</a>
1001 the drive it's on the transfer will be dramatically less secure.</p>
1002
1003 </div>--><!-- End .main
1004 </div> End #transfer-key .step-->
1005
1006 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
1007 <div id="webmail-and-GnuPG" class="step">
1008 <div class="main">
1009
1010 <h3>Webmail and GnuPG</h3>
1011
1012 <p>When you use a web browser to access your email, you're using webmail,
1013 an email program stored on a distant website. Unlike webmail, your desktop
1014 email program runs on your own computer. Although webmail can't decrypt
1015 encrypted email, it will still display it in its encrypted form. If you
1016 primarily use webmail, you'll know to open your email client when you receive
1017 a scrambled email.</p>
1018
1019 </div><!-- End .main -->
1020 </div><!-- End #webmail-and-GnuPG .step-->
1021
1022 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~
1023 <div id="step-5d" class="step">
1024 <div class="main">
1025
1026 <h3>Make your public key part of your online identity</h3>
1027
1028 <p> First add your public key fingerprint to your email signature, then
1029 compose an email to at least five of your friends, telling them you just
1030 set up GnuPG and mentioning your public key fingerprint. Link to this guide
1031 and ask them to join you. Don't forget that there's also an awesome <a
1032 href="infographic.html">infographic to share.</a></p>
1033
1034 <p class="notes">Start writing your public key fingerprint anywhere someone
1035 would see your email address: your social media profiles, blog, Website,
1036 or business card. (At the Free Software Foundation, we put ours on our
1037 <a href="https://fsf.org/about/staff">staff page</a>.) We need to get our
1038 culture to the point that we feel like something is missing when we see an
1039 email address without a public key fingerprint.</p>
1040
1041 </div>--><!-- End .main
1042 </div> End #step-5d .step-->
1043 </div></section><!-- End #section5 -->
1044
1045 <!-- ~~~~~~~~~ Section 6: Next steps ~~~~~~~~~ -->
1046 <section class="row" id="section6">
1047 <div id="step-click_here" class="step">
1048 <div class="main">
1049
1050 <h2><a href="next_steps.html">Great job! Check out the next steps.</a></h2>
1051
1052 </div><!-- End .main -->
1053 </div><!-- End #step-click_here .step-->
1054 </section><!-- End #section6 -->
1055
1056 <!-- ~~~~~~~~~ FAQ ~~~~~~~~~ -->
1057 <!-- When un-commenting this section go to main.css and search
1058 for /* Guide Sections Background */ then add #faq to the desired color
1059 <section class="row" id="faq"><div>
1060 <div class="sidebar">
1061
1062 <h2>FAQ</h2>
1063
1064 </div>
1065 <div class="main">
1066
1067 <dl>
1068 <dt>My key expired</dt>
1069 <dd>Answer coming soon.</dd>
1070
1071 <dt>Who can read encrypted messages? Who can read signed ones?</dt>
1072 <dd>Answer coming soon.</dd>
1073
1074 <dt>My email program is opening at times I don't want it to open/is now my
1075 default program and I don't want it to be.</dt>
1076 <dd>Answer coming soon.</dd>
1077 </dl>
1078
1079 </div>
1080 </div>
1081 </section> --><!-- End #faq -->
1082
1083 <!-- ~~~~~~~~~ Footer ~~~~~~~~~ -->
1084 <footer class="row" id="footer"><div>
1085 <div id="copyright">
1086
1087 <h4><a href="https://u.fsf.org/ys"><img
1088 alt="Free Software Foundation"
1089 src="//static.fsf.org/nosvn/enc-dev0/img/fsf-logo.png" /></a></h4>
1090
1091 <p>Copyright &copy; 2014-2016 <a
1092 href="https://u.fsf.org/ys">Free Software Foundation</a>, Inc. <a
1093 href="https://my.fsf.org/donate/privacypolicy.html">Privacy Policy</a>. Please
1094 support our work by <a href="https://u.fsf.org/yr">joining us as an associate
1095 member.</a></p>
1096
1097 <p>The images on this page are under a <a
1098 href="https://creativecommons.org/licenses/by/4.0/">Creative Commons
1099 Attribution 4.0 license (or later version)</a>, and the rest of it is under
1100 a <a href="https://creativecommons.org/licenses/by-sa/4.0">Creative Commons
1101 Attribution-ShareAlike 4.0 license (or later version)</a>. Download the <a
1102 href="http://agpl.fsf.org/emailselfdefense.fsf.org/edward/CURRENT/edward.tar.gz">
1103 source code of Edward reply bot</a> by Andrew Engelbrecht
1104 &lt;sudoman@ninthfloor.org&gt; and Josh Drake &lt;zamnedix@gnu.org&gt;,
1105 available under the GNU Affero General Public License. <a
1106 href="http://www.gnu.org/licenses/license-list.html#OtherLicenses">Why these
1107 licenses?</a></p>
1108
1109 <p>Fonts used in the guide &amp; infographic: <a
1110 href="https://www.google.com/fonts/specimen/Dosis">Dosis</a> by Pablo
1111 Impallari, <a href="http://www.google.com/fonts/specimen/Signika">Signika</a>
1112 by Anna Giedry&#347;, <a
1113 href="http://www.google.com/fonts/specimen/Archivo+Narrow">Archivo
1114 Narrow</a> by Omnibus-Type, <a
1115 href="https://libreplanet.org/wiki/GPG_guide/Graphics_Howto#Pitfalls">PXL-2000</a>
1116 by Florian Cramer.</p>
1117
1118 <p>Download the <a href="emailselfdefense_source.zip">source package</a>
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