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 </div>
 125
 126       <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>
 127
 128
 129     </div>
 130
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 132
 133
 134     <div id="sidebar">
 135
 136
 137
 138 <h2>Archive</h2>
 139 <ul>
 140
 141 <li>2016
 142 <ul>
 143
 144 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/01/">January (3)</a></li>
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 164 <li><a href="http://people.skolelinux.org/pere/blog/archive/2016/11/">November (2)</a></li>
 165
 166 </ul></li>
 167
 168 <li>2015
 169 <ul>
 170
 171 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/01/">January (7)</a></li>
 172
 173 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/02/">February (6)</a></li>
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 182
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 184
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 186
 187 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/09/">September (2)</a></li>
 188
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 190
 191 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/11/">November (6)</a></li>
 192
 193 <li><a href="http://people.skolelinux.org/pere/blog/archive/2015/12/">December (3)</a></li>
 194
 195 </ul></li>
 196
 197 <li>2014
 198 <ul>
 199
 200 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 201
 202 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 203
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 205
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 207
 208 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/05/">May (1)</a></li>
 209
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 211
 212 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/07/">July (2)</a></li>
 213
 214 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/08/">August (2)</a></li>
 215
 216 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/09/">September (5)</a></li>
 217
 218 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/10/">October (6)</a></li>
 219
 220 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/11/">November (3)</a></li>
 221
 222 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 223
 224 </ul></li>
 225
 226 <li>2013
 227 <ul>
 228
 229 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 230
 231 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
 232
 233 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/03/">March (9)</a></li>
 234
 235 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/04/">April (6)</a></li>
 236
 237 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/05/">May (9)</a></li>
 238
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 240
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 242
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 244
 245 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/09/">September (5)</a></li>
 246
 247 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/10/">October (7)</a></li>
 248
 249 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/11/">November (9)</a></li>
 250
 251 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 252
 253 </ul></li>
 254
 255 <li>2012
 256 <ul>
 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 259
 260 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 261
 262 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 263
 264 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/04/">April (12)</a></li>
 265
 266 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 267
 268 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/06/">June (20)</a></li>
 269
 270 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/07/">July (17)</a></li>
 271
 272 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/08/">August (6)</a></li>
 273
 274 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/09/">September (9)</a></li>
 275
 276 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 277
 278 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 279
 280 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 281
 282 </ul></li>
 283
 284 <li>2011
 285 <ul>
 286
 287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 288
 289 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 290
 291 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 292
 293 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 294
 295 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 296
 297 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 298
 299 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 300
 301 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 302
 303 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 304
 305 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 306
 307 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 308
 309 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 310
 311 </ul></li>
 312
 313 <li>2010
 314 <ul>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 317
 318 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 319
 320 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 321
 322 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 323
 324 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 325
 326 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 327
 328 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 329
 330 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 331
 332 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 333
 334 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 335
 336 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 337
 338 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 339
 340 </ul></li>
 341
 342 <li>2009
 343 <ul>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 346
 347 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 348
 349 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 350
 351 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 352
 353 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 354
 355 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 356
 357 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 358
 359 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 360
 361 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 362
 363 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 364
 365 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 366
 367 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 368
 369 </ul></li>
 370
 371 <li>2008
 372 <ul>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 375
 376 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 377
 378 </ul></li>
 379
 380 </ul>
 381
 382
 383
 384 <h2>Tags</h2>
 385 <ul>
 386
 387  <li><a href="http://people.skolelinux.org/pere/blog/tags/3d-printer">3d-printer (13)</a></li>
 388
 389  <li><a href="http://people.skolelinux.org/pere/blog/tags/amiga">amiga (1)</a></li>
 390
 391  <li><a href="http://people.skolelinux.org/pere/blog/tags/aros">aros (1)</a></li>
 392
 393  <li><a href="http://people.skolelinux.org/pere/blog/tags/bankid">bankid (4)</a></li>
 394
 395  <li><a href="http://people.skolelinux.org/pere/blog/tags/bitcoin">bitcoin (9)</a></li>
 396
 397  <li><a href="http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (16)</a></li>
 398
 399  <li><a href="http://people.skolelinux.org/pere/blog/tags/bsa">bsa (2)</a></li>
 400
 401  <li><a href="http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (2)</a></li>
 402
 403  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian">debian (138)</a></li>
 404
 405  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (157)</a></li>
 406
 407  <li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (10)</a></li>
 408
 409  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (16)</a></li>
 410
 411  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (23)</a></li>
 412
 413  <li><a href="http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (4)</a></li>
 414
 415  <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (330)</a></li>
 416
 417  <li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (23)</a></li>
 418
 419  <li><a href="http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (12)</a></li>
 420
 421  <li><a href="http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (28)</a></li>
 422
 423  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 424
 425  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (18)</a></li>
 426
 427  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 428
 429  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 430
 431  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (13)</a></li>
 432
 433  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (19)</a></li>
 434
 435  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 436
 437  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 438
 439  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 440
 441  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 442
 443  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 444
 445  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (39)</a></li>
 446
 447  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (8)</a></li>
 448
 449  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (280)</a></li>
 450
 451  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (182)</a></li>
 452
 453  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (26)</a></li>
 454
 455  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 456
 457  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (61)</a></li>
 458
 459  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (94)</a></li>
 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (10)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (4)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (51)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (49)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (4)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (10)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (42)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (2)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (8)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (59)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (38)</a></li>
 502
 503 </ul>
 504
 505
 506     </div>
 507     <p style="text-align: right">
 508  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 509 </p>
 510
 511   </body>
 512 </html>