blog/How_to_use_the_Signal_app_if_you_only_have_a_land_line__ie_no_mobile_phone_.html

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   6     <title>Petter Reinholdtsen: How to use the Signal app if you only have a land line (ie no mobile phone)</title>
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  14  <h1>
  15      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  16
  17  </h1>
  18
  19 </div>
  20
  21
  22     <div class="entry">
  23       <div class="title">How to use the Signal app if you only have a land line (ie no mobile phone)</div>
  24       <div class="date"> 3rd July 2016</div>
  25       <div class="body"><p>For a while now, I have wanted to test
  26 <a href="https://whispersystems.org/">the Signal app</a>, as it is
  27 said to provide end to end encrypted communication and several of my
  28 friends and family are already using it.  As I by choice do not own a
  29 mobile phone, this proved to be harder than expected.  And I wanted to
  30 have the source of the client and know that it was the code used on my
  31 machine.  But yesterday I managed to get it working.  I used the
  32 Github source, compared it to the source in
  33 <a href="https://chrome.google.com/webstore/detail/signal-private-messenger/bikioccmkafdpakkkcpdbppfkghcmihk?hl=en-US">the
  34 Signal Chrome app</a> available from the Chrome web store, applied
  35 patches to use the production Signal servers, started the app and
  36 asked for the hidden "register without a smart phone" form.  Here is
  37 the recipe how I did it.</p>
  38
  39 <p>First, I fetched the Signal desktop source from Github, using
  40
  41 <pre>
  42 git clone https://github.com/WhisperSystems/Signal-Desktop.git
  43 </pre>
  44
  45 <p>Next, I patched the source to use the production servers, to be
  46 able to talk to other Signal users:</p>
  47
  48 <pre>
  49 cat &lt;&lt;EOF | patch -p0
  50 diff -ur ./js/background.js userdata/Default/Extensions/bikioccmkafdpakkkcpdbppfkghcmihk/0.15.0_0/js/background.js
  51 --- ./js/background.js  2016-06-29 13:43:15.630344628 +0200
  52 +++ userdata/Default/Extensions/bikioccmkafdpakkkcpdbppfkghcmihk/0.15.0_0/js/background.js    2016-06-29 14:06:29.530300934 +0200
  53 @@ -47,8 +47,8 @@
  54          });
  55      });
  56
  57 -    var SERVER_URL = 'https://textsecure-service-staging.whispersystems.org';
  58 -    var ATTACHMENT_SERVER_URL = 'https://whispersystems-textsecure-attachments-staging.s3.amazonaws.com';
  59 +    var SERVER_URL = 'https://textsecure-service-ca.whispersystems.org:4433';
  60 +    var ATTACHMENT_SERVER_URL = 'https://whispersystems-textsecure-attachments.s3.amazonaws.com';
  61      var messageReceiver;
  62      window.getSocketStatus = function() {
  63          if (messageReceiver) {
  64 diff -ur ./js/expire.js userdata/Default/Extensions/bikioccmkafdpakkkcpdbppfkghcmihk/0.15.0_0/js/expire.js
  65 --- ./js/expire.js      2016-06-29 13:43:15.630344628 +0200
  66 +++ userdata/Default/Extensions/bikioccmkafdpakkkcpdbppfkghcmihk/0.15.0_0/js/expire.js2016-06-29 14:06:29.530300934 +0200
  67 @@ -1,6 +1,6 @@
  68  ;(function() {
  69      'use strict';
  70 -    var BUILD_EXPIRATION = 0;
  71 +    var BUILD_EXPIRATION = 1474492690000;
  72
  73      window.extension = window.extension || {};
  74
  75 EOF
  76 </pre>
  77
  78 <p>The first part is changing the servers, and the second is updating
  79 an expiration timestamp.  This timestamp need to be updated regularly.
  80 It is set 90 days in the future by the build process (Gruntfile.js).
  81 The value is seconds since 1970 times 1000, as far as I can tell.</p>
  82
  83 <p>Based on a tip and good help from the #nuug IRC channel, I wrote a
  84 script to launch Signal in Chromium.</p>
  85
  86 <pre>
  87 #!/bin/sh
  88 cd $(dirname $0)
  89 mkdir -p userdata
  90 exec chromium \
  91   --proxy-server="socks://localhost:9050" \
  92   --user-data-dir=`pwd`/userdata --load-and-launch-app=`pwd`
  93 </pre>
  94
  95 <p> The script start the app and configure Chromium to use the Tor
  96 SOCKS5 proxy to make sure those controlling the Signal servers (today
  97 Amazon and Whisper Systems) as well as those listening on the lines
  98 will have a harder time location my laptop based on the Signal
  99 connections if they use source IP address.</p>
 100
 101 <p>When the script starts, one need to follow the instructions under
 102 "Standalone Registration" in the CONTRIBUTING.md file in the git
 103 repository.  I right clicked on the Signal window to get up the
 104 Chromium debugging tool, visited the 'Console' tab and wrote
 105 'extension.install("standalone")' on the console prompt to get the
 106 registration form.  Then I entered by land line phone number and
 107 pressed 'Call'.  5 seconds later the phone rang and a robot voice
 108 repeated the verification code three times.  After entering the number
 109 into the verification code field in the form, I could start using
 110 Signal from my laptop.
 111
 112 <p>As far as I can tell, The Signal app will leak who is talking to
 113 whom and thus who know who to those controlling the central server,
 114 but such leakage is hard to avoid with a centrally controlled server
 115 setup.  It is something to keep in mind when using Signal - the
 116 content of your chats are harder to intercept, but the meta data
 117 exposing your contact network is available to people you do not know.
 118 So better than many options, but not great.  And sadly the usage is
 119 connected to my land line, thus allowing those controlling the server
 120 to associate it to my home and person.  I would prefer it if only
 121 those I knew could tell who I was on Signal.  There are options
 122 avoiding such information leakage, but most of my friends are not
 123 using them, so I am stuck with Signal for now.</p>
 124
 125 <p><strong>Update 2017-01-10</strong>: There is an updated blog post
 126 on this topic in
 127 <a href="http://people.skolelinux.org/pere/blog/Experience_and_updated_recipe_for_using_the_Signal_app_without_a_mobile_phone.html">Experience
 128 and updated recipe for using the Signal app without a mobile
 129 phone</a>.</p>
 130 </div>
 131
 132       <div class="tags">Tags: <a href="http://people.skolelinux.org/pere/blog/tags/debian">debian</a>, <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet</a>, <a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance</a>.</div>
 133
 134
 135     </div>
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 144 <h2>Archive</h2>
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 236
 237 </ul></li>
 238
 239 <li>2015
 240 <ul>
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 242 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
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 265
 266 </ul></li>
 267
 268 <li>2014
 269 <ul>
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 271 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
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 294
 295 </ul></li>
 296
 297 <li>2013
 298 <ul>
 299
 300 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 301
 302 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
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 313
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 315
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 317
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 319
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 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 323
 324 </ul></li>
 325
 326 <li>2012
 327 <ul>
 328
 329 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 330
 331 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 332
 333 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 334
 335 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 336
 337 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 338
 339 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 340
 341 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 342
 343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 346
 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 352
 353 </ul></li>
 354
 355 <li>2011
 356 <ul>
 357
 358 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 359
 360 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 361
 362 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 363
 364 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 365
 366 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 367
 368 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 369
 370 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 371
 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 375
 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 377
 378 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 381
 382 </ul></li>
 383
 384 <li>2010
 385 <ul>
 386
 387 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 388
 389 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 392
 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 394
 395 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 396
 397 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 398
 399 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 400
 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 402
 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 404
 405 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 410
 411 </ul></li>
 412
 413 <li>2009
 414 <ul>
 415
 416 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 417
 418 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 419
 420 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 421
 422 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 423
 424 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 425
 426 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 427
 428 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 429
 430 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 431
 432 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 433
 434 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 435
 436 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 437
 438 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 439
 440 </ul></li>
 441
 442 <li>2008
 443 <ul>
 444
 445 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 446
 447 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 448
 449 </ul></li>
 450
 451 </ul>
 452
 453
 454
 455 <h2>Tags</h2>
 456 <ul>
 457
 458  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 459
 460  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 461
 462  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 463
 464  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 465
 466  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (11)</a></li>
 467
 468  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 469
 470  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 471
 472  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 473
 474  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (167)</a></li>
 475
 476  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 477
 478  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 479
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 524  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
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 531
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 566  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 567
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 571
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 573
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 578  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 579
 580  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 581
 582 </ul>
 583
 584
 585     </div>
 586     <p style="text-align: right">
 587  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 588 </p>
 589
 590   </body>
 591 </html>