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
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 135     </div>
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 144 <h2>Archive</h2>
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 225
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 227
 228 <li>2015
 229 <ul>
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 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
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 250
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 252
 253 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 254
 255 </ul></li>
 256
 257 <li>2014
 258 <ul>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
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 281
 282 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 283
 284 </ul></li>
 285
 286 <li>2013
 287 <ul>
 288
 289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
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 302
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 306
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 308
 309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 310
 311 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 312
 313 </ul></li>
 314
 315 <li>2012
 316 <ul>
 317
 318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 323
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 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 327
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 329
 330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 337
 338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 339
 340 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 341
 342 </ul></li>
 343
 344 <li>2011
 345 <ul>
 346
 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 356
 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 358
 359 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 364
 365 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 366
 367 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 368
 369 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 370
 371 </ul></li>
 372
 373 <li>2010
 374 <ul>
 375
 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 377
 378 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 379
 380 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 381
 382 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 383
 384 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 385
 386 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 387
 388 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 389
 390 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 391
 392 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 393
 394 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 395
 396 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 397
 398 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 399
 400 </ul></li>
 401
 402 <li>2009
 403 <ul>
 404
 405 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 406
 407 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 408
 409 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 410
 411 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 412
 413 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 414
 415 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 416
 417 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 418
 419 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 420
 421 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 422
 423 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 424
 425 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 426
 427 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 428
 429 </ul></li>
 430
 431 <li>2008
 432 <ul>
 433
 434 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 435
 436 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 437
 438 </ul></li>
 439
 440 </ul>
 441
 442
 443
 444 <h2>Tags</h2>
 445 <ul>
 446
 447  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (16)</a></li>
 448
 449  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 450
 451  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 452
 453  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 454
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 456
 457  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (17)</a></li>
 458
 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (164)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (4)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (25)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (391)</a></li>
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 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
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 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
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 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
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 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (3)</a></li>
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 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
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 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
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 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
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 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
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 508
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 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
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 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (299)</a></li>
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 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (191)</a></li>
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 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
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 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
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 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
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 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 534
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 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (6)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
 544
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 547  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
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 551  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
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 555  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 556
 557  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 558
 559  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
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 561  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 562
 563  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (13)</a></li>
 564
 565  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (69)</a></li>
 566
 567  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 568
 569  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (41)</a></li>
 570
 571 </ul>
 572
 573
 574     </div>
 575     <p style="text-align: right">
 576  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 577 </p>
 578
 579   </body>
 580 </html>