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23 <h1>Email Self-Defense
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76 <div class=
"fsf-emphasis">
78 <p>We fight for computer users' rights, and promote the development of free (as
79 in freedom) software. Resisting bulk surveillance is very important to us.
</p>
81 <p><strong>Please donate to support Email Self-Defense. We need to keep
82 improving it, and making more materials, for the benefit of people around
83 the world taking the first step towards protecting their privacy.
</strong></p>
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100 Bulk surveillance violates our fundamental rights and makes free speech
101 risky. This guide will teach you a basic surveillance self-defense skill: email
102 encryption. Once you've finished, you'll be able to send and receive emails
103 that are scrambled to make sure a surveillance agent or thief intercepting
104 your email can't read them. All you need is a computer with an Internet
105 connection, an email account, and about forty minutes.
</p>
107 <p>Even if you have nothing to hide, using encryption helps protect the privacy
108 of people you communicate with, and makes life difficult for bulk surveillance
109 systems. If you do have something important to hide, you're in good company;
110 these are the same tools that whistleblowers use to protect their identities
111 while shining light on human rights abuses, corruption and other crimes.
</p>
113 <p>In addition to using encryption, standing up
114 to surveillance requires fighting politically for a
<a
115 href=
"http://gnu.org/philosophy/surveillance-vs-democracy.html">reduction
116 in the amount of data collected on us
</a>, but the essential first step is
117 to protect yourself and make surveillance of your communication as difficult
118 as possible. This guide helps you do that. It is designed for beginners, but
119 if you already know the basics of GnuPG or are an experienced free software
120 user, you'll enjoy the advanced tips and the
<a href=
"workshops.html">guide
121 to teaching your friends
</a>.
</p>
123 </div><!-- End .intro -->
124 </div></header><!-- End #header -->
126 <!-- ~~~~~~~~~ Section 1: Get the pieces ~~~~~~~~~ -->
127 <section class=
"row" id=
"section1"><div>
129 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
130 <div class=
"section-intro">
132 <h2><em>#
1</em> Get the pieces
</h2>
134 <p class=
"notes">This guide relies on software which is
<a
135 href=
"https://www.gnu.org/philosophy/free-sw.html">freely licensed
</a>; it's
136 completely transparent and anyone can copy it or make their own version. This
137 makes it safer from surveillance than proprietary software (like Windows or Mac
138 OS). To defend your freedom as well as protect yourself from surveillance, we
139 recommend you switch to a free software operating system like GNU/Linux. Learn
140 more about free software at
<a href=
"https://u.fsf.org/ys">fsf.org
</a>.
</p>
142 <p>To get started, you'll need the IceDove desktop email program installed
143 on your computer. For your system, IceDove may be known by the alternate name
144 "Thunderbird." Email programs are another way to access the same email accounts
145 you can access in a browser (like Gmail), but provide extra features.
</p>
147 <p>If you already have an email program, you can skip to
<a
148 href=
"#step-1b">Step
1.b
</a>.
</p>
150 </div><!-- End .section-intro -->
152 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
153 <div id=
"step-1a" class=
"step">
154 <div class=
"sidebar">
157 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1a-install-wizard.png"
158 alt=
"Step 1.A: Install Wizard" /></p>
160 </div><!-- /.sidebar -->
163 <h3><em>Step
1.a
</em> Set up your email program with your email account
</h3>
165 <p>Open your email program and follow the wizard (step-by-step walkthrough)
166 that sets it up with your email account.
</p>
168 <p>Look for the letters SSL, TLS, or STARTTLS to the right of the servers
169 when you're setting up your account. If you don't see them, you will still
170 be able to use encryption, but this means that the people running your email
171 system are running behind the industry standard in protecting your security
172 and privacy. We recommend that you send them a friendly email asking them
173 to enable SSL, TLS, or STARTTLS for your email server. They will know what
174 you're talking about, so it's worth making the request even if you aren't
175 an expert on these security systems.
</p>
177 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
178 <div class=
"troubleshooting">
180 <h4>Troubleshooting
</h4>
183 <dt>The wizard doesn't launch
</dt>
184 <dd>You can launch the wizard yourself, but the menu option for doing so is
185 named differently in each email program. The button to launch it will be in
186 the program's main menu, under
"New" or something similar, titled something
187 like
"Add account" or
"New/Existing email account."</dd>
189 <dt>The wizard can't find my account or isn't downloading my mail
</dt>
190 <dd>Before searching the Web, we recommend you start by asking other people
191 who use your email system, to figure out the correct settings.
</dd>
193 <dt class=
"feedback">Don't see a solution to your problem?
</dt>
194 <dd class=
"feedback">Please let us know on the
<a
195 href=
"https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
199 </div><!-- /.troubleshooting -->
200 </div><!-- End .main -->
201 </div><!-- End #step1-a .step -->
203 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
204 <div id=
"step-1b" class=
"step">
207 <h3><em>Step
1.b
</em> Get GnuPG by downloading GPG4Win
</h3>
209 <p>GPG4Win is a software package that includes GnuPG.
<a
210 href=
"https://www.gpg4win.org/">Download
</a> and install it, choosing default
211 options whenever asked. After it's installed, you can close any windows that
214 <p>There are major security flaws in versions of GnuPG provided by GPG4Win
215 prior to
3.1.2. Make sure you have GPG4Win
3.1.2 or later.
</p>
217 </div><!-- End .main -->
218 </div><!-- End #step1-b .step -->
220 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
221 <div id=
"step-1c" class=
"step">
222 <div class=
"sidebar">
224 <li><img src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1b-01-tools-addons.png"
225 alt=
"Step 1.C: Tools -> Add-ons" /></li>
226 <li><img src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1b-02-search.png"
227 alt=
"Step 1.C: Search Add-ons" /></li>
228 <li><img src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step1b-03-install.png"
229 alt=
"Step 1.C: Install Add-ons" /></li>
232 </div><!-- /.sidebar -->
235 <h3><em>Step
1.c
</em> Install the Enigmail plugin for your email program
</h3>
237 <p>In your email program's menu, select Add-ons (it may be in the Tools
238 section). Make sure Extensions is selected on the left. Do you see Enigmail?
239 Make sure it's the latest version. If so, skip this step.
</p>
241 <p>If not, search
"Enigmail" with the search bar in the upper right. You
242 can take it from here. Restart your email program when you're done.
</p>
244 <p>There are major security flaws in Enigmail prior to version
2.0.7. Make
245 sure you have Enigmail
2.0.7 or later.
</p>
247 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
248 <div class=
"troubleshooting">
250 <h4>Troubleshooting
</h4>
253 <dt>I can't find the menu.
</dt>
254 <dd>In many new email programs, the main menu is represented by an image of
255 three stacked horizontal bars.
</dd>
257 <dt>My email looks weird
</dt>
258 <dd>Enigmail doesn't tend to play nice with HTML, which is used to format
259 emails, so it may disable your HTML formatting automatically. To send an
260 HTML-formatted email without encryption or a signature, hold down the Shift
261 key when you select compose. You can then write an email as if Enigmail
264 <dt class=
"feedback">Don't see a solution to your problem?
</dt>
265 <dd class=
"feedback">Please let us know on the
<a
266 href=
"https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
270 </div><!-- /.troubleshooting -->
271 </div><!-- End .main -->
272 </div><!-- End #step-1b .step -->
273 </div></section><!-- End #section1 -->
275 <!-- ~~~~~~~~~ Section 2: Make your keys ~~~~~~~~~ -->
276 <section class=
"row" id=
"section2"><div>
278 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
279 <div class=
"section-intro">
281 <h2><em>#
2</em> Make your keys
</h2>
283 <p>To use the GnuPG system, you'll need a public key and a private key (known
284 together as a keypair). Each is a long string of randomly generated numbers
285 and letters that are unique to you. Your public and private keys are linked
286 together by a special mathematical function.
</p>
288 <p>Your public key isn't like a physical key, because it's stored in the open
289 in an online directory called a keyserver. People download it and use it,
290 along with GnuPG, to encrypt emails they send to you. You can think of the
291 keyserver as a phonebook; people who want to send you encrypted email can
292 look up your public key.
</p>
294 <p>Your private key is more like a physical key, because you keep it to
295 yourself (on your computer). You use GnuPG and your private key together to
296 descramble encrypted emails other people send to you.
<span style=
"font-weight:
297 bold;">You should never share your private key with anyone, under any
298 circumstances.
</span></p>
300 <p>In addition to encryption and decryption, you can also use these keys to
301 sign messages and check the authenticity of other people's signatures. We'll
302 discuss this more in the next section.
</p>
304 </div><!-- End .section-intro -->
306 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
307 <div id=
"step-2a" class=
"step">
308 <div class=
"sidebar">
311 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/step2a-01-make-keypair.png"
312 alt=
"Step 2.A: Make a Keypair" /></p>
314 </div><!-- /.sidebar -->
317 <h3><em>Step
2.a
</em> Make a keypair
</h3>
319 <p>The Enigmail Setup wizard may start automatically. If it doesn't, select
320 Enigmail
→ Setup Wizard from your email program's menu. You don't need
321 to read the text in the window that pops up unless you'd like to, but it's
322 good to read the text on the later screens of the wizard. Click Next with
323 the default options selected, except in these instances, which are listed
324 in the order they appear:
</p>
327 <li>On the screen titled
"Encryption," select
"Encrypt all of my messages
328 by default, because privacy is critical to me."</li>
330 <li>On the screen titled
"Signing," select
"Don't sign my messages by
333 <li>On the screen titled
"Key Selection," select
"I want to create a new
334 key pair for signing and encrypting my email."</li>
336 <li>On the screen titled
"Create Key," pick a strong password! You can
337 do it manually, or you can use the Diceware method. Doing it manually
338 is faster but not as secure. Using Diceware takes longer and requires
339 dice, but creates a password that is much harder for attackers to figure
340 out. To use it, read the section
"Make a secure passphrase with Diceware" in
<a
341 href=
"https://theintercept.com/2015/03/26/passphrases-can-memorize-attackers-cant-guess/">
342 this article
</a> by Micah Lee.
</li>
345 <p>If you'd like to pick a password manually, come up with something
346 you can remember which is at least twelve characters long, and includes
347 at least one lower case and upper case letter and at least one number or
348 punctuation symbol. Never pick a password you've used elsewhere. Don't use
349 any recognizable patterns, such as birthdays, telephone numbers, pets' names,
350 song lyrics, quotes from books, and so on.
</p>
352 <p class=
"notes">The program will take a little while to finish the next
353 step, the
"Key Creation" screen. While you wait, do something else with your
354 computer, like watching a movie or browsing the Web. The more you use the
355 computer at this point, the faster the key creation will go.
</p>
357 <p><span style=
"font-weight: bold;">When the
"Key Generation Completed" screen
358 pops up, select Generate Certificate and choose to save it in a safe place on
359 your computer (we recommend making a folder called
"Revocation Certificate"
360 in your home folder and keeping it there). This step is essential for your
361 email self-defense, as you'll learn more about in
<a href=
"#section5">Section
364 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
365 <div class=
"troubleshooting">
367 <h4>Troubleshooting
</h4>
370 <dt>I can't find the Enigmail menu.
</dt>
371 <dd>In many new email programs, the main menu is represented by an image
372 of three stacked horizontal bars. Enigmail may be inside a section called
375 <dt>More resources
</dt>
376 <dd>If you're having trouble with our
377 instructions or just want to learn more, check out
<a
378 href=
"https://www.enigmail.net/documentation/Key_Management#Generating_your_own_key_pair">
379 Enigmail's wiki instructions for key generation
</a>.
</dd>
381 <dt class=
"feedback">Don't see a solution to your problem?
</dt>
382 <dd class=
"feedback">Please let us know on the
<a
383 href=
"https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
387 </div><!-- /.troubleshooting -->
389 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
390 <div class=
"troubleshooting">
395 <dt>Command line key generation
</dt>
396 <dd>If you prefer using the command line for a higher
397 degree of control, you can follow the documentation from
<a
398 href=
"https://www.gnupg.org/gph/en/manual/c14.html#AEN25">The GNU Privacy
399 Handbook
</a>. Make sure you stick with
"RSA and RSA" (the default),
400 because it's newer and more secure than the algorithms the documentation
401 recommends. Also make sure your key is at least
2048 bits, or
4096 if you
402 want to be extra secure.
</dd>
404 <dt>Advanced key pairs
</dt>
405 <dd>When GnuPG creates a new keypair, it compartmentalizes
406 the encryption function from the signing function through
<a
407 href=
"https://wiki.debian.org/Subkeys">subkeys
</a>. If you use
408 subkeys carefully, you can keep your GnuPG identity much more
409 secure and recover from a compromised key much more quickly.
<a
410 href=
"https://alexcabal.com/creating-the-perfect-gpg-keypair/">Alex Cabal
</a>
411 and
<a href=
"http://keyring.debian.org/creating-key.html">the Debian wiki
</a>
412 provide good guides for setting up a secure subkey configuration.
</dd>
415 </div><!-- /.troubleshooting -->
416 </div><!-- End .main -->
417 </div><!-- End #step-2a .step -->
419 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
420 <div id=
"step-2b" class=
"step">
423 <h3><em>Step
2.b
</em> Upload your public key to a keyserver
</h3>
425 <p>In your email program's menu, select Enigmail
→ Key Management.
</p>
427 <p>Right click on your key and select Upload Public Keys to Keyserver. You
428 don't have to use the default keyserver. If, after research, you would like
429 to change to a different default keyserver, you can change that setting
430 manually in the Enigmail preferences.
</p>
432 <p class=
"notes">Now someone who wants to send you an encrypted message can
433 download your public key from the Internet. There are multiple keyservers
434 that you can select from the menu when you upload, but they are all copies
435 of each other, so it doesn't matter which one you use. However, it sometimes
436 takes a few hours for them to match each other when a new key is uploaded.
</p>
438 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
439 <div class=
"troubleshooting">
441 <h4>Troubleshooting
</h4>
444 <dt>The progress bar never finishes
</dt>
445 <dd>Close the upload popup, make sure you are connected to the Internet,
446 and try again. If that doesn't work, try again, selecting a different
449 <dt>My key doesn't appear in the list
</dt>
450 <dd>Try checking
"Display All Keys by Default."</dd>
452 <dt>More documentation
</dt>
453 <dd>If you're having trouble with our
454 instructions or just want to learn more, check out
<a
455 href=
"https://www.enigmail.net/documentation/Key_Management#Distributing_your_public_key">
456 Enigmail's documentation
</a>.
</dd>
458 <dt class=
"feedback">Don't see a solution to your problem?
</dt>
459 <dd class=
"feedback">Please let us know on the
<a
460 href=
"https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
464 </div><!-- /.troubleshooting -->
466 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
467 <div class=
"troubleshooting">
472 <dt>Uploading a key from the command line
</dt>
473 <dd>You can also upload your keys to a keyserver through the
<a
474 href=
"https://www.gnupg.org/gph/en/manual/x457.html">command line
</a>.
<a
475 href=
"https://sks-keyservers.net/overview-of-pools.php">The sks Web site
</a>
476 maintains a list of highly interconnected keyservers. You can also
<a
477 href=
"https://www.gnupg.org/gph/en/manual/x56.html#AEN64">directly export
478 your key
</a> as a file on your computer.
</dd>
481 </div><!-- /.troubleshooting -->
482 </div><!-- End .main -->
483 </div><!-- End #step-2b .step -->
485 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
486 <div id=
"terminology" class=
"step">
489 <h3>GnuPG, OpenPGP, what?
</h3>
491 <p>In general, the terms GnuPG, GPG, GNU Privacy Guard, OpenPGP and PGP
492 are used interchangeably. Technically, OpenPGP (Pretty Good Privacy) is the
493 encryption standard, and GNU Privacy Guard (often shortened to GPG or GnuPG)
494 is the program that implements the standard. Enigmail is a plug-in program
495 for your email program that provides an interface for GnuPG.
</p>
497 </div><!-- End .main -->
498 </div><!-- End #terminology.step-->
499 </div></section><!-- End #section2 -->
501 <!-- ~~~~~~~~~ Section 3: Try it out ~~~~~~~~~ -->
502 <section class=
"row" id=
"section3"><div>
504 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
505 <div class=
"section-intro">
507 <h2><em>#
3</em> Try it out!
</h2>
509 <p>Now you'll try a test correspondence with a computer program named Edward,
510 who knows how to use encryption. Except where noted, these are the same
511 steps you'd follow when corresponding with a real, live person.
</p>
513 <!-- <p>NOTE: Edward is currently having some technical difficulties, so he
514 may take a long time to respond, or not respond at all. We're sorry about
515 this and we're working hard to fix it. Your key will still work even without
516 testing with Edward.</p> -->
517 </div><!-- End .section-intro -->
519 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
520 <div id=
"step-3a" class=
"step">
521 <div class=
"sidebar">
524 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section3-try-it-out.png"
525 alt=
"Try it out." /></p>
527 </div><!-- /.sidebar -->
530 <h3><em>Step
3.a
</em> Send Edward your public key
</h3>
532 <p>This is a special step that you won't have to do when corresponding
533 with real people. In your email program's menu, go to Enigmail
→ Key
534 Management. You should see your key in the list that pops up. Right click
535 on your key and select Send Public Keys by Email. This will create a new
536 draft message, as if you had just hit the Write button.
</p>
538 <p>Address the message to
<a
539 href=
"mailto:edward-en@fsf.org">edward-en@fsf.org
</a>. Put at least one word
540 (whatever you want) in the subject and body of the email. Don't send yet.
</p>
542 <p>The lock icon in the top left should be yellow, meaning encryption is
543 turned on. We want this first special message to be unencrypted, so
544 click the icon once to turn it off. The lock should become grey, with a
545 blue dot on it (to alert you that the setting has been changed from the
546 default). Once encryption is off, hit Send.
</p>
548 <p class=
"notes">It may take two or three minutes for Edward to
549 respond. In the meantime, you might want to skip ahead and check out the
<a
550 href=
"#section5">Use it Well
</a> section of this guide. Once he's responded,
551 head to the next step. From here on, you'll be doing just the same thing as
552 when corresponding with a real person.
</p>
554 <p>When you open Edward's reply, GnuPG may prompt you for your password
555 before using your private key to decrypt it.
</p>
557 </div><!-- End .main -->
558 </div><!-- End #step-3a .step -->
560 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
561 <div id=
"step-3b" class=
"step">
564 <h3><em>Step
3.b
</em> Send a test encrypted email
</h3>
566 <p>Write a new email in your email program, addressed to
<a
567 href=
"mailto:edward-en@fsf.org">edward-en@fsf.org
</a>. Make the subject
568 "Encryption test" or something similar and write something in the body.
</p>
570 <p>The lock icon in the top left of the window should be yellow, meaning
571 encryption is on. This will be your default from now on.
</p>
573 <p class=
"notes">Next to the lock, you'll notice an icon of a pencil. We'll
574 get to this in a moment.
</p>
576 <p>Click Send. Enigmail will pop up a window that says
"Recipients not valid,
577 not trusted or not found."</p>
579 <p>To encrypt an email to Edward, you need his public key, so now you'll have
580 Enigmail download it from a keyserver. Click Download Missing Keys and use
581 the default in the pop-up that asks you to choose a keyserver. Once it finds
582 keys, check the first one (Key ID starting with C), then select ok. Select
583 ok in the next pop-up.
</p>
585 <p>Now you are back at the
"Recipients not valid, not trusted or not found"
586 screen. Check the box in front of Edward's key and click Send.
</p>
588 <p class=
"notes">Since you encrypted this email with Edward's public key,
589 Edward's private key is required to decrypt it. Edward is the only one with
590 his private key, so no one except him can decrypt it.
</p>
592 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
593 <div class=
"troubleshooting">
595 <h4>Troubleshooting
</h4>
598 <dt>Enigmail can't find Edward's key
</dt>
599 <dd>Close the pop-ups that have appeared since you clicked Send. Make sure
600 you are connected to the Internet and try again. If that doesn't work, repeat
601 the process, choosing a different keyserver when it asks you to pick one.
</dd>
603 <dt>Unscrambled messages in the Sent folder
</dt>
604 <dd>Even though you can't decrypt messages encrypted to someone else's key,
605 your email program will automatically save a copy encrypted to your public key,
606 which you'll be able to view from the Sent folder like a normal email. This
607 is normal, and it doesn't mean that your email was not sent encrypted.
</dd>
609 <dt>More resources
</dt>
610 <dd>If you're still having trouble with our
611 instructions or just want to learn more, check out
<a
612 href=
"https://www.enigmail.net/documentation/Signature_and_Encryption#Encrypting_a_message">
613 Enigmail's wiki
</a>.
</dd>
615 <dt class=
"feedback">Don't see a solution to your problem?
</dt>
616 <dd class=
"feedback">Please let us know on the
<a
617 href=
"https://libreplanet.org/wiki/GPG_guide/Public_Review">feedback
621 </div><!-- /.troubleshooting -->
623 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
624 <div class=
"troubleshooting">
629 <dt>Encrypt messages from the command line
</dt>
630 <dd>You can also encrypt and decrypt messages and files from the
<a
631 href=
"https://www.gnupg.org/gph/en/manual/x110.html">command line
</a>,
632 if that's your preference. The option --armor makes the encrypted output
633 appear in the regular character set.
</dd>
636 </div><!-- /.troubleshooting -->
637 </div><!-- End .main -->
638 </div><!-- End #step-3b .step -->
640 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
641 <div id=
"step-headers_unencrypted" class=
"step">
644 <h3><em>Important:
</em> Security tips
</h3>
646 <p>Even if you encrypt your email, the subject line is not encrypted, so
647 don't put private information there. The sending and receiving addresses
648 aren't encrypted either, so a surveillance system can still figure out who
649 you're communicating with. Also, surveillance agents will know that you're
650 using GnuPG, even if they can't figure out what you're saying. When you
651 send attachments, Enigmail will give you the choice to encrypt them or not,
652 independent of the actual email.
</p>
654 <p>For greater security against potential attacks, you can turn off
655 HTML. Instead, you can render the message body as plain text.
</p>
657 </div><!-- End .main -->
658 </div><!-- End #step-headers_unencrypted .step-->
660 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
661 <div id=
"step-3c" class=
"step">
664 <h3><em>Step
3.c
</em> Receive a response
</h3>
666 <p>When Edward receives your email, he will use his private key to decrypt
667 it, then reply to you.
</p>
669 <p class=
"notes">It may take two or three minutes for Edward to
670 respond. In the meantime, you might want to skip ahead and check out the
<a
671 href=
"#section5">Use it Well
</a> section of this guide.
</p>
673 </div><!-- End .main -->
674 </div><!-- End #step-3c .step -->
676 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
677 <div id=
"step-3d" class=
"step">
680 <h3><em>Step
3.d
</em> Send a test signed email
</h3>
682 <p>GnuPG includes a way for you to sign messages and files, verifying that
683 they came from you and that they weren't tampered with along the way. These
684 signatures are stronger than their pen-and-paper cousins -- they're impossible
685 to forge, because they're impossible to create without your private key
686 (another reason to keep your private key safe).
</p>
688 <p>You can sign messages to anyone, so it's a great way to make people
689 aware that you use GnuPG and that they can communicate with you securely. If
690 they don't have GnuPG, they will be able to read your message and see your
691 signature. If they do have GnuPG, they'll also be able to verify that your
692 signature is authentic.
</p>
694 <p>To sign an email to Edward, compose any message to him and click the
695 pencil icon next to the lock icon so that it turns gold. If you sign a
696 message, GnuPG may ask you for your password before it sends the message,
697 because it needs to unlock your private key for signing.
</p>
699 <p>With the lock and pencil icons, you can choose whether each message will
700 be encrypted, signed, both, or neither.
</p>
705 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
706 <div id=
"step-3e" class=
"step">
709 <h3><em>Step
3.e
</em> Receive a response
</h3>
711 <p>When Edward receives your email, he will use your public key (which
712 you sent him in
<a href=
"#step-3a">Step
3.A
</a>) to verify the message
713 you sent has not been tampered with and to encrypt his reply to you.
</p>
715 <p class=
"notes">It may take two or three minutes for Edward to
716 respond. In the meantime, you might want to skip ahead and check out the
<a
717 href=
"#section5">Use it Well
</a> section of this guide.
</p>
719 <p>Edward's reply will arrive encrypted, because he prefers to use encryption
720 whenever possible. If everything goes according to plan, it should say
721 "Your signature was verified." If your test signed email was also encrypted,
722 he will mention that first.
</p>
724 <p>When you receive Edward's email and open it, Enigmail will
725 automatically detect that it is encrypted with your public key, and
726 then it will use your private key to decrypt it.
</p>
728 <p>Notice the bar that Enigmail shows you above the message, with
729 information about the status of Edward's key.
</p>
731 </div><!-- End .main -->
732 </div><!-- End #step-3e .step -->
735 <!-- ~~~~~~~~~ Section 4: Learn the Web of Trust ~~~~~~~~~ -->
736 <section class=
"row" id=
"section4"><div>
738 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
739 <div class=
"section-intro">
741 <h2><em>#
4</em> Learn the Web of Trust
</h2>
743 <p>Email encryption is a powerful technology, but it has a weakness;
744 it requires a way to verify that a person's public key is actually
745 theirs. Otherwise, there would be no way to stop an attacker from making
746 an email address with your friend's name, creating keys to go with it and
747 impersonating your friend. That's why the free software programmers that
748 developed email encryption created keysigning and the Web of Trust.
</p>
750 <p>When you sign someone's key, you are publicly saying that you've verified
751 that it belongs to them and not someone else.
</p>
753 <p>Signing keys and signing messages use the same type of mathematical
754 operation, but they carry very different implications. It's a good practice
755 to generally sign your email, but if you casually sign people's keys, you
756 may accidently end up vouching for the identity of an imposter.
</p>
758 <p>People who use your public key can see who has signed it. Once you've
759 used GnuPG for a long time, your key may have hundreds of signatures. You
760 can consider a key to be more trustworthy if it has many signatures from
761 people that you trust. The Web of Trust is a constellation of GnuPG users,
762 connected to each other by chains of trust expressed through signatures.
</p>
764 </div><!-- End .section-intro -->
766 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
767 <div id=
"step-4a" class=
"step">
768 <div class=
"sidebar">
771 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section4-web-of-trust.png"
772 alt=
"Section 4: Web of Trust" /></p>
774 </div><!-- /.sidebar -->
777 <h3><em>Step
4.a
</em> Sign a key
</h3>
779 <p>In your email program's menu, go to Enigmail
→ Key Management.
</p>
781 <p>Right click on Edward's public key and select Sign Key from the context
784 <p>In the window that pops up, select
"I will not answer" and click ok.
</p>
786 <p>Now you should be back at the Key Management menu. Select Keyserver
→
787 Upload Public Keys and hit ok.
</p>
789 <p class=
"notes">You've just effectively said
"I trust that Edward's public
790 key actually belongs to Edward." This doesn't mean much because Edward isn't
791 a real person, but it's good practice.
</p>
793 <!--<div id="pgp-pathfinder">
795 <form enctype="application/x-www-form-urlencoded" action="/mk_path.cgi"
798 <p><strong>From:</strong><input type="text" value="xD41A008"
801 <p><strong>To:</strong><input type="text" value="50BD01x4" name="TO"></p>
803 <p class="buttons"><input type="submit" value="trust paths" name="PATHS"><input
804 type="reset" value="reset" name=".reset"></p>
808 </div>End #pgp-pathfinder -->
809 </div><!-- End .main -->
810 </div><!-- End #step-4a .step -->
812 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
813 <div id=
"step-identify_keys" class=
"step">
816 <h3>Identifying keys: Fingerprints and IDs
</h3>
818 <p>People's public keys are usually identified by their key fingerprint,
819 which is a string of digits like F357AA1A5B1FA42CFD9FE52A9FF2194CC09A61E8
820 (for Edward's key). You can see the fingerprint for your public key, and
821 other public keys saved on your computer, by going to Enigmail
→ Key
822 Management in your email program's menu, then right clicking on the key
823 and choosing Key Properties. It's good practice to share your fingerprint
824 wherever you share your email address, so that people can double-check that
825 they have the correct public key when they download yours from a keyserver.
</p>
827 <p class=
"notes">You may also see public keys referred to by a shorter
828 key ID. This key ID is visible directly from the Key Management
829 window. These eight character key IDs were previously used for
830 identification, which used to be safe, but is no longer reliable. You
831 need to check the full fingerprint as part of verifying you have the
832 correct key for the person you are trying to contact. Spoofing, in
833 which someone intentionally generates a key with a fingerprint whose
834 final eight characters are the same as another, is unfortunately
837 </div><!-- End .main -->
838 </div><!-- End #step-identify_keys .step-->
840 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
841 <div id=
"check-ids-before-signing" class=
"step">
844 <h3><em>Important:
</em> What to consider when signing keys
</h3>
846 <p>Before signing a person's key, you need to be confident that it actually
847 belongs to them, and that they are who they say they are. Ideally, this
848 confidence comes from having interactions and conversations with them over
849 time, and witnessing interactions between them and others. Whenever signing
850 a key, ask to see the full public key fingerprint, and not just the shorter
851 key ID. If you feel it's important to sign the key of someone you've just
852 met, also ask them to show you their government identification, and make
853 sure the name on the ID matches the name on the public key. In Enigmail,
854 answer honestly in the window that pops up and asks
"How carefully have you
855 verified that the key you are about to sign actually belongs to the person(s)
858 <!-- ~~~~~~~~~ Troubleshooting ~~~~~~~~~ -->
859 <div class=
"troubleshooting">
864 <dt>Master the Web of Trust
</dt>
865 <dd>Unfortunately, trust does not spread between users the way
<a
866 href=
"http://fennetic.net/irc/finney.org/~hal/web_of_trust.html">many people
867 think
</a>. One of best ways to strengthen the GnuPG community is to deeply
<a
868 href=
"https://www.gnupg.org/gph/en/manual/x334.html">understand
</a> the Web of
869 Trust and to carefully sign as many people's keys as circumstances permit.
</dd>
871 <dt>Set ownertrust
</dt>
872 <dd>If you trust someone enough to validate other people's keys, you can assign
873 them an ownertrust level through Enigmails's key management window. Right
874 click on the other person's key, go to the
"Select Owner Trust" menu option,
875 select the trustlevel and click OK. Only do this once you feel you have a
876 deep understanding of the Web of Trust.
</dd>
879 </div><!-- /.troubleshooting -->
880 </div><!-- End .main -->
881 </div><!-- End #check-ids-before-signing .step-->
882 </div></section><!-- End #section4 -->
884 <!-- ~~~~~~~~~ Section 5: Use it well ~~~~~~~~~ -->
885 <section id=
"section5" class=
"row"><div>
887 <!-- ~~~~~~~~~ section introduction: interspersed text ~~~~~~~~~ -->
888 <div class=
"section-intro">
890 <h2><em>#
5</em> Use it well
</h2>
892 <p>Everyone uses GnuPG a little differently, but it's important to follow
893 some basic practices to keep your email secure. Not following them, you
894 risk the privacy of the people you communicate with, as well as your own,
895 and damage the Web of Trust.
</p>
897 </div><!-- End .section-intro -->
899 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
900 <div id=
"step-5a" class=
"step">
901 <div class=
"sidebar">
904 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section5-01-use-it-well.png"
905 alt=
"Section 5: Use it Well (1)" /></p>
907 </div><!-- /.sidebar -->
910 <h3>When should I encrypt? When should I sign?
</h3>
912 <p>The more you can encrypt your messages, the better. If you only encrypt
913 emails occasionally, each encrypted message could raise a red flag for
914 surveillance systems. If all or most of your email is encrypted, people
915 doing surveillance won't know where to start. That's not to say that only
916 encrypting some of your email isn't helpful -- it's a great start and it
917 makes bulk surveillance more difficult.
</p>
919 <p>Unless you don't want to reveal your own identity (which requires other
920 protective measures), there's no reason not to sign every message, whether or
921 not you are encrypting. In addition to allowing those with GnuPG to verify
922 that the message came from you, signing is a non-intrusive way to remind
923 everyone that you use GnuPG and show support for secure communication. If you
924 often send signed messages to people that aren't familiar with GnuPG, it's
925 nice to also include a link to this guide in your standard email signature
926 (the text kind, not the cryptographic kind).
</p>
928 </div><!-- End .main -->
929 </div><!-- End #step-5a .step -->
931 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
932 <div id=
"step-5b" class=
"step">
933 <div class=
"sidebar">
936 src=
"//static.fsf.org/nosvn/enc-dev0/img/en/screenshots/section5-02-use-it-well.png"
937 alt=
"Section 5: Use it Well (2)" /></p>
939 </div><!-- /.sidebar -->
942 <h3>Be wary of invalid keys
</h3>
944 <p>GnuPG makes email safer, but it's still important to watch out for invalid
945 keys, which might have fallen into the wrong hands. Email encrypted with
946 invalid keys might be readable by surveillance programs.
</p>
948 <p>In your email program, go back to the first encrypted email that Edward
949 sent you. Because Edward encrypted it with your public key, it will have a
950 message from Enigmail at the top, which most likely says
"Enigmail: Part of
951 this message encrypted."</p>
953 <p><b>When using GnuPG, make a habit of glancing at that bar. The program
954 will warn you there if you get an email signed with a key that can't
957 </div><!-- End .main -->
958 </div><!-- End #step-5b .step -->
960 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
961 <div id=
"step-5c" class=
"step">
964 <h3>Copy your revocation certificate to somewhere safe
</h3>
966 <p>Remember when you created your keys and saved the revocation certificate
967 that GnuPG made? It's time to copy that certificate onto the safest digital
968 storage that you have -- the ideal thing is a flash drive, disk, or hard
969 drive stored in a safe place in your home, not on a device you carry with
972 <p>If your private key ever gets lost or stolen, you'll need this certificate
973 file to let people know that you are no longer using that keypair.
</p>
975 </div><!-- End .main -->
976 </div><!-- End #step-5c .step -->
978 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
979 <div id=
"step-lost_key" class=
"step">
982 <h3><em>Important:
</em> act swiftly if someone gets your private key
</h3>
984 <p>If you lose your private key or someone else gets ahold
985 of it (say, by stealing or cracking your computer), it's
986 important to revoke it immediately before someone else uses
987 it to read your encrypted email or forge your signature. This
988 guide doesn't cover how to revoke a key, but you can follow these
<a
989 href=
"https://www.hackdiary.com/2004/01/18/revoking-a-gpg-key/">instructions
</a>.
990 After you're done revoking, make a new key and send an email to everyone
991 with whom you usually use your key to make sure they know, including a copy
994 </div><!-- End .main -->
995 </div><!-- End #step-lost_key .step-->
997 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
998 <!---<div id="transfer-key" class="step">
1001 <h3>Transferring you key</h3>
1003 <p>You can use Enigmail's <a
1004 href="https://www.enigmail.net/documentation/Key_Management">key management
1005 window</a> to import and export keys. If you want to be able to read
1006 your encrypted email on a different computer, you will need to export
1007 your secret key from here. Be warned, if you transfer the key without <a
1008 href="https://help.ubuntu.com/community/EncryptedFilesystemsOnRemovableStorage">encrypting</a>
1009 the drive it's on the transfer will be dramatically less secure.</p>
1011 </div>--><!-- End .main
1012 </div> End #transfer-key .step-->
1014 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~ -->
1015 <div id=
"webmail-and-GnuPG" class=
"step">
1018 <h3>Webmail and GnuPG
</h3>
1020 <p>When you use a web browser to access your email, you're using webmail,
1021 an email program stored on a distant website. Unlike webmail, your desktop
1022 email program runs on your own computer. Although webmail can't decrypt
1023 encrypted email, it will still display it in its encrypted form. If you
1024 primarily use webmail, you'll know to open your email client when you receive
1025 a scrambled email.
</p>
1027 </div><!-- End .main -->
1028 </div><!-- End #webmail-and-GnuPG .step-->
1030 <!-- ~~~~~~~~~ a div for each step ~~~~~~~~~
1031 <div id="step-5d" class="step">
1034 <h3>Make your public key part of your online identity</h3>
1036 <p> First add your public key fingerprint to your email signature, then
1037 compose an email to at least five of your friends, telling them you just
1038 set up GnuPG and mentioning your public key fingerprint. Link to this guide
1039 and ask them to join you. Don't forget that there's also an awesome <a
1040 href="infographic.html">infographic to share.</a></p>
1042 <p class="notes">Start writing your public key fingerprint anywhere someone
1043 would see your email address: your social media profiles, blog, Website,
1044 or business card. (At the Free Software Foundation, we put ours on our
1045 <a href="https://fsf.org/about/staff">staff page</a>.) We need to get our
1046 culture to the point that we feel like something is missing when we see an
1047 email address without a public key fingerprint.</p>
1049 </div>--><!-- End .main
1050 </div> End #step-5d .step-->
1051 </div></section><!-- End #section5 -->
1053 <!-- ~~~~~~~~~ Section 6: Next steps ~~~~~~~~~ -->
1054 <section class=
"row" id=
"section6">
1055 <div id=
"step-click_here" class=
"step">
1058 <h2><a href=
"next_steps.html">Great job! Check out the next steps.
</a></h2>
1060 </div><!-- End .main -->
1061 </div><!-- End #step-click_here .step-->
1062 </section><!-- End #section6 -->
1064 <!-- ~~~~~~~~~ FAQ ~~~~~~~~~ -->
1065 <!-- When un-commenting this section go to main.css and search
1066 for /* Guide Sections Background */ then add #faq to the desired color
1067 <section class="row" id="faq"><div>
1068 <div class="sidebar">
1076 <dt>My key expired</dt>
1077 <dd>Answer coming soon.</dd>
1079 <dt>Who can read encrypted messages? Who can read signed ones?</dt>
1080 <dd>Answer coming soon.</dd>
1082 <dt>My email program is opening at times I don't want it to open/is now my
1083 default program and I don't want it to be.</dt>
1084 <dd>Answer coming soon.</dd>
1089 </section> --><!-- End #faq -->
1091 <!-- ~~~~~~~~~ Footer ~~~~~~~~~ -->
1092 <footer class=
"row" id=
"footer"><div>
1093 <div id=
"copyright">
1095 <h4><a href=
"https://u.fsf.org/ys"><img
1096 alt=
"Free Software Foundation"
1097 src=
"//static.fsf.org/nosvn/enc-dev0/img/fsf-logo.png" /></a></h4>
1099 <p>Copyright
© 2014-
2016 <a
1100 href=
"https://u.fsf.org/ys">Free Software Foundation
</a>, Inc.
<a
1101 href=
"https://my.fsf.org/donate/privacypolicy.html">Privacy Policy
</a>. Please
1102 support our work by
<a href=
"https://u.fsf.org/yr">joining us as an associate
1105 <p>The images on this page are under a
<a
1106 href=
"https://creativecommons.org/licenses/by/4.0/">Creative Commons
1107 Attribution
4.0 license (or later version)
</a>, and the rest of it is under
1108 a
<a href=
"https://creativecommons.org/licenses/by-sa/4.0">Creative Commons
1109 Attribution-ShareAlike
4.0 license (or later version)
</a>. Download the
<a
1110 href=
"http://agpl.fsf.org/emailselfdefense.fsf.org/edward/CURRENT/edward.tar.gz">
1111 source code of Edward reply bot
</a> by Andrew Engelbrecht
1112 <andrew@engelbrecht.io
> and Josh Drake
<zamnedix@gnu.org
>,
1113 available under the GNU Affero General Public License.
<a
1114 href=
"http://www.gnu.org/licenses/license-list.html#OtherLicenses">Why these
1117 <p>Fonts used in the guide
& infographic:
<a
1118 href=
"https://www.google.com/fonts/specimen/Dosis">Dosis
</a> by Pablo
1119 Impallari,
<a href=
"http://www.google.com/fonts/specimen/Signika">Signika
</a>
1120 by Anna Giedry
ś,
<a
1121 href=
"http://www.google.com/fonts/specimen/Archivo+Narrow">Archivo
1122 Narrow
</a> by Omnibus-Type,
<a
1123 href=
"https://libreplanet.org/wiki/GPG_guide/Graphics_Howto#Pitfalls">PXL-
2000</a>
1124 by Florian Cramer.
</p>
1126 <p>Download the
<a href=
"emailselfdefense_source.zip">source package
</a>
1127 for this guide, including fonts, image source files and the text of Edward's
1130 <p>This site uses the Weblabels standard for labeling
<a
1131 href=
"https://www.fsf.org/campaigns/freejs">free JavaScript
</a>. View
1132 the JavaScript
<a href=
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