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25 <h1>Email Self-Defense
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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>
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>
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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>
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>
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>
122 </div><!-- End .intro -->
123 </div></header><!-- End #header -->
125 <!-- ~~~~~~~~~ Section 1: Get the pieces ~~~~~~~~~ -->
126 <section class=
"row" id=
"section1"><div>
128 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
129 <div class=
"section-intro">
131 <h2><em>#
1</em> Get the pieces
</h2>
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>
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>
148 <p>If you already have an email program, you can skip to
<a
149 href=
"#step-1b">Step
1.b
</a>.
</p>
151 </div><!-- End .section-intro -->
153 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
154 <div id=
"step-1a" class=
"step">
155 <div class=
"sidebar">
158 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1a-install-wizard.png"
159 alt=
"Step 1.A: Install Wizard" /></p>
161 </div><!-- /.sidebar -->
164 <h3><em>Step
1.a
</em> Set up your email program with your email account
</h3>
166 <p>Open your email program and follow the wizard (step-by-step walkthrough)
167 that sets it up with your email account.
</p>
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>
178 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
179 <div class=
"troubleshooting">
181 <h4>Troubleshooting
</h4>
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>
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>
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
200 </div><!-- /.troubleshooting -->
201 </div><!-- End .main -->
202 </div><!-- End #step1-a .step -->
204 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
205 <div id=
"step-1b" class=
"step">
206 <div class=
"sidebar">
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>
216 </div><!-- /.sidebar -->
219 <h3><em>Step
1.b
</em> Install the Enigmail plugin for your email program
</h3>
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>
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>
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>
232 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
233 <div class=
"troubleshooting">
235 <h4>Troubleshooting
</h4>
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>
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
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
255 </div><!-- /.troubleshooting -->
256 </div><!-- End .main -->
257 </div><!-- End #step-1b .step -->
258 </div></section><!-- End #section1 -->
260 <!-- ~~~~~~~~~ Section 2: Make your keys ~~~~~~~~~ -->
261 <section class=
"row" id=
"section2"><div>
263 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
264 <div class=
"section-intro">
266 <h2><em>#
2</em> Make your keys
</h2>
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>
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>
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>
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>
289 </div><!-- End .section-intro -->
291 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
292 <div id=
"step-2a" class=
"step">
293 <div class=
"sidebar">
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>
299 </div><!-- /.sidebar -->
302 <h3><em>Step
2.a
</em> Make a keypair
</h3>
304 <p>The Enigmail Setup wizard may start automatically. If it doesn't, select
305 Enigmail
→ 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>
312 <li>On the screen titled
"Encryption," select
"Encrypt all of my messages
313 by default, because privacy is critical to me."</li>
315 <li>On the screen titled
"Signing," select
"Don't sign my messages by
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>
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>
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>
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>
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
349 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
350 <div class=
"troubleshooting">
352 <h4>Troubleshooting
</h4>
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
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
→ Setup Wizard.
</dd>
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>
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
377 </div><!-- /.troubleshooting -->
379 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
380 <div class=
"troubleshooting">
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>
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>
405 </div><!-- /.troubleshooting -->
406 </div><!-- End .main -->
407 </div><!-- End #step-2a .step -->
409 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
410 <div id=
"step-2b" class=
"step">
413 <h3><em>Step
2.b
</em> Upload your public key to a keyserver
</h3>
415 <p>In your email program's menu, select Enigmail
→ Key Management.
</p>
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>
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>
428 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
429 <div class=
"troubleshooting">
431 <h4>Troubleshooting
</h4>
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
439 <dt>My key doesn't appear in the list
</dt>
440 <dd>Try checking
"Display All Keys by Default."</dd>
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>
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
454 </div><!-- /.troubleshooting -->
456 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
457 <div class=
"troubleshooting">
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>
471 </div><!-- /.troubleshooting -->
472 </div><!-- End .main -->
473 </div><!-- End #step-2b .step -->
475 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
476 <div id=
"terminology" class=
"step">
479 <h3>GnuPG, OpenPGP, what?
</h3>
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>
487 </div><!-- End .main -->
488 </div><!-- End #terminology.step-->
489 </div></section><!-- End #section2 -->
491 <!-- ~~~~~~~~~ Section 3: Try it out ~~~~~~~~~ -->
492 <section class=
"row" id=
"section3"><div>
494 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
495 <div class=
"section-intro">
497 <h2><em>#
3</em> Try it out!
</h2>
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>
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 -->
509 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
510 <div id=
"step-3a" class=
"step">
511 <div class=
"sidebar">
514 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section3-try-it-out.png"
515 alt=
"Try it out." /></p>
517 </div><!-- /.sidebar -->
520 <h3><em>Step
3.a
</em> Send Edward your public key
</h3>
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
→ 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>
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>
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>
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>
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>
547 </div><!-- End .main -->
548 </div><!-- End #step-3a .step -->
550 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
551 <div id=
"step-3b" class=
"step">
554 <h3><em>Step
3.b
</em> Send a test encrypted email
</h3>
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>
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>
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>
566 <p>Click Send. Enigmail will pop up a window that says
"Recipients not valid,
567 not trusted or not found."</p>
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>
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>
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>
582 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
583 <div class=
"troubleshooting">
585 <h4>Troubleshooting
</h4>
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>
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>
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>
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
611 </div><!-- /.troubleshooting -->
613 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
614 <div class=
"troubleshooting">
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>
626 </div><!-- /.troubleshooting -->
627 </div><!-- End .main -->
628 </div><!-- End #step-3b .step -->
630 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
631 <div id=
"step-headers_unencrypted" class=
"step">
634 <h3><em>Important:
</em> Security tips
</h3>
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>
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
> Message Body As
> Plain
649 </div><!-- End .main -->
650 </div><!-- End #step-headers_unencrypted .step-->
652 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
653 <div id=
"step-3c" class=
"step">
656 <h3><em>Step
3.c
</em> Receive a response
</h3>
658 <p>When Edward receives your email, he will use his private key to decrypt
659 it, then reply to you.
</p>
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>
665 </div><!-- End .main -->
666 </div><!-- End #step-3c .step -->
668 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
669 <div id=
"step-3d" class=
"step">
672 <h3><em>Step
3.d
</em> Send a test signed email
</h3>
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>
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>
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>
691 <p>With the lock and pencil icons, you can choose whether each message will
692 be encrypted, signed, both, or neither.
</p>
697 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
698 <div id=
"step-3e" class=
"step">
701 <h3><em>Step
3.e
</em> Receive a response
</h3>
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>
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>
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>
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>
720 <p>Notice the bar that Enigmail shows you above the message, with
721 information about the status of Edward's key.
</p>
723 </div><!-- End .main -->
724 </div><!-- End #step-3e .step -->
727 <!-- ~~~~~~~~~ Section 4: Learn the Web of Trust ~~~~~~~~~ -->
728 <section class=
"row" id=
"section4"><div>
730 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
731 <div class=
"section-intro">
733 <h2><em>#
4</em> Learn the Web of Trust
</h2>
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>
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>
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>
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>
756 </div><!-- End .section-intro -->
758 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
759 <div id=
"step-4a" class=
"step">
760 <div class=
"sidebar">
763 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section4-web-of-trust.png"
764 alt=
"Section 4: Web of Trust" /></p>
766 </div><!-- /.sidebar -->
769 <h3><em>Step
4.a
</em> Sign a key
</h3>
771 <p>In your email program's menu, go to Enigmail
→ Key Management.
</p>
773 <p>Right click on Edward's public key and select Sign Key from the context
776 <p>In the window that pops up, select
"I will not answer" and click ok.
</p>
778 <p>Now you should be back at the Key Management menu. Select Keyserver
→
779 Upload Public Keys and hit ok.
</p>
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>
785 <!--<div id="pgp-pathfinder">
787 <form enctype="application/x-www-form-urlencoded" action="/mk_path.cgi"
790 <p><strong>From:</strong><input type="text" value="xD41A008"
793 <p><strong>To:</strong><input type="text" value="50BD01x4" name="TO"></p>
795 <p class="buttons"><input type="submit" value="trust paths" name="PATHS"><input
796 type="reset" value="reset" name=".reset"></p>
800 </div>End #pgp-pathfinder -->
801 </div><!-- End .main -->
802 </div><!-- End #step-4a .step -->
804 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
805 <div id=
"step-identify_keys" class=
"step">
808 <h3>Identifying keys: Fingerprints and IDs
</h3>
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
→ 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>
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
829 </div><!-- End .main -->
830 </div><!-- End #step-identify_keys .step-->
832 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
833 <div id=
"check-ids-before-signing" class=
"step">
836 <h3><em>Important:
</em> What to consider when signing keys
</h3>
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)
850 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
851 <div class=
"troubleshooting">
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>
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>
871 </div><!-- /.troubleshooting -->
872 </div><!-- End .main -->
873 </div><!-- End #check-ids-before-signing .step-->
874 </div></section><!-- End #section4 -->
876 <!-- ~~~~~~~~~ Section 5: Use it well ~~~~~~~~~ -->
877 <section id=
"section5" class=
"row"><div>
879 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
880 <div class=
"section-intro">
882 <h2><em>#
5</em> Use it well
</h2>
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>
889 </div><!-- End .section-intro -->
891 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
892 <div id=
"step-5a" class=
"step">
893 <div class=
"sidebar">
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>
899 </div><!-- /.sidebar -->
902 <h3>When should I encrypt? When should I sign?
</h3>
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>
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>
920 </div><!-- End .main -->
921 </div><!-- End #step-5a .step -->
923 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
924 <div id=
"step-5b" class=
"step">
925 <div class=
"sidebar">
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>
931 </div><!-- /.sidebar -->
934 <h3>Be wary of invalid keys
</h3>
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>
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>
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
949 </div><!-- End .main -->
950 </div><!-- End #step-5b .step -->
952 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
953 <div id=
"step-5c" class=
"step">
956 <h3>Copy your revocation certificate to somewhere safe
</h3>
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
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>
967 </div><!-- End .main -->
968 </div><!-- End #step-5c .step -->
970 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
971 <div id=
"step-lost_key" class=
"step">
974 <h3><em>Important:
</em> act swiftly if someone gets your private key
</h3>
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
986 </div><!-- End .main -->
987 </div><!-- End #step-lost_key .step-->
989 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
990 <!---<div id="transfer-key" class="step">
993 <h3>Transferring you key</h3>
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>
1003 </div>--><!-- End .main
1004 </div> End #transfer-key .step-->
1006 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
1007 <div id=
"webmail-and-GnuPG" class=
"step">
1010 <h3>Webmail and GnuPG
</h3>
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>
1019 </div><!-- End .main -->
1020 </div><!-- End #webmail-and-GnuPG .step-->
1022 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~
1023 <div id="step-5d" class="step">
1026 <h3>Make your public key part of your online identity</h3>
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>
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>
1041 </div>--><!-- End .main
1042 </div> End #step-5d .step-->
1043 </div></section><!-- End #section5 -->
1045 <!-- ~~~~~~~~~ Section 6: Next steps ~~~~~~~~~ -->
1046 <section class=
"row" id=
"section6">
1047 <div id=
"step-click_here" class=
"step">
1050 <h2><a href=
"next_steps.html">Great job! Check out the next steps.
</a></h2>
1052 </div><!-- End .main -->
1053 </div><!-- End #step-click_here .step-->
1054 </section><!-- End #section6 -->
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">
1068 <dt>My key expired</dt>
1069 <dd>Answer coming soon.</dd>
1071 <dt>Who can read encrypted messages? Who can read signed ones?</dt>
1072 <dd>Answer coming soon.</dd>
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>
1081 </section> --><!-- End #faq -->
1083 <!-- ~~~~~~~~~ Footer ~~~~~~~~~ -->
1084 <footer class=
"row" id=
"footer"><div>
1085 <div id=
"copyright">
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>
1091 <p>Copyright
© 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
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 <sudoman@ninthfloor.org
> and Josh Drake
<zamnedix@gnu.org
>,
1105 available under the GNU Affero General Public License.
<a
1106 href=
"http://www.gnu.org/licenses/license-list.html#OtherLicenses">Why these
1109 <p>Fonts used in the guide
& 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
ś,
<a
1113 href=
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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>
1118 <p>Download the
<a href=
"emailselfdefense_source.zip">source package
</a>
1119 for this guide, including fonts, image source files and the text of Edward's
1122 <p>This site uses the Weblabels standard for labeling
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1123 href=
"https://www.fsf.org/campaigns/freejs">free JavaScript
</a>. View
1124 the JavaScript
<a href=
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1125 rel=
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</a>.
</p>
1127 </div><!-- /#copyright -->
1129 <p class=
"credits">Infographic and guide design by
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"external"
1130 href=
"http://jplusplus.org"><strong>Journalism++
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1131 src=
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"text/javascript"
1139 src=
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1141 <script type=
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1142 // @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-
2.0.txt GPL-
2.0-or-later
1143 var _paq = _paq || [];
1144 _paq.push([
"trackPageView"]);
1145 _paq.push([
"enableLinkTracking"]);
1148 var u = ((
"https:" == document.location.protocol) ?
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"http") +
"://"+
"piwik.fsf.org//";
1149 _paq.push([
"setTrackerUrl", u+
"piwik.php"]);
1150 _paq.push([
"setSiteId",
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1151 var d=document, g=d.createElement(
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"script")[
0]; g.
type=
"text/javascript";
1152 g.defer=true; g.async=true; g.src=u+
"piwik.js"; s.parentNode.insertBefore(g,s);
1156 <!-- End Piwik Code -->
1157 <!-- Piwik Image Tracker -->
1158 <noscript><img src=
"https://piwik.fsf.org//piwik.php?idsite=13&rec=1" style=
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"" /></noscript>