blog/Easier_recipe_to_observe_the_cell_phones_around_you.html

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   6     <title>Petter Reinholdtsen: Easier recipe to observe the cell phones around you</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">Easier recipe to observe the cell phones around you</div>
  24       <div class="date">24th September 2017</div>
  25       <div class="body"><p>A little more than a month ago I wrote
  26 <a href="http://people.skolelinux.org/pere/blog/Simpler_recipe_on_how_to_make_a_simple__7_IMSI_Catcher_using_Debian.html">how
  27 to observe the SIM card ID (aka IMSI number) of mobile phones talking
  28 to nearby mobile phone base stations using Debian GNU/Linux and a
  29 cheap USB software defined radio</a>, and thus being able to pinpoint
  30 the location of people and equipment (like cars and trains) with an
  31 accuracy of a few kilometer.  Since then we have worked to make the
  32 procedure even simpler, and it is now possible to do this without any
  33 manual frequency tuning and without building your own packages.</p>
  34
  35 <p>The <a href="https://tracker.debian.org/pkg/gr-gsm">gr-gsm</a>
  36 package is now included in Debian testing and unstable, and the
  37 IMSI-catcher code no longer require root access to fetch and decode
  38 the GSM data collected using gr-gsm.</p>
  39
  40 <p>Here is an updated recipe, using packages built by Debian and a git
  41 clone of two python scripts:</p>
  42
  43 <ol>
  44
  45 <li>Start with a Debian machine running the Buster version (aka
  46   testing).</li>
  47
  48 <li>Run '<tt>apt install gr-gsm python-numpy python-scipy
  49   python-scapy</tt>' as root to install required packages.</li>
  50
  51 <li>Fetch the code decoding GSM packages using '<tt>git clone
  52   github.com/Oros42/IMSI-catcher.git</tt>'.</li>
  53
  54 <li>Insert USB software defined radio supported by GNU Radio.</li>
  55
  56 <li>Enter the IMSI-catcher directory and run '<tt>python
  57   scan-and-livemon</tt>' to locate the frequency of nearby base
  58   stations and start listening for GSM packages on one of them.</li>
  59
  60 <li>Enter the IMSI-catcher directory and run '<tt>python
  61   simple_IMSI-catcher.py</tt>' to display the collected information.</li>
  62
  63 </ol>
  64
  65 <p>Note, due to a bug somewhere the scan-and-livemon program (actually
  66 <a href="https://github.com/ptrkrysik/gr-gsm/issues/336">its underlying
  67 program grgsm_scanner</a>) do not work with the HackRF radio.  It does
  68 work with RTL 8232 and other similar USB radio receivers you can get
  69 very cheaply
  70 (<a href="https://www.ebay.com/sch/items/?_nkw=rtl+2832">for example
  71 from ebay</a>), so for now the solution is to scan using the RTL radio
  72 and only use HackRF for fetching GSM data.</p>
  73
  74 <p>As far as I can tell, a cell phone only show up on one of the
  75 frequencies at the time, so if you are going to track and count every
  76 cell phone around you, you need to listen to all the frequencies used.
  77 To listen to several frequencies, use the --numrecv argument to
  78 scan-and-livemon to use several receivers.  Further, I am not sure if
  79 phones using 3G or 4G will show as talking GSM to base stations, so
  80 this approach might not see all phones around you.  I typically see
  81 0-400 IMSI numbers an hour when looking around where I live.</p>
  82
  83 <p>I've tried to run the scanner on a
  84 <a href="https://wiki.debian.org/RaspberryPi">Raspberry Pi 2 and 3
  85 running Debian Buster</a>, but the grgsm_livemon_headless process seem
  86 to be too CPU intensive to keep up.  When GNU Radio print 'O' to
  87 stdout, I am told there it is caused by a buffer overflow between the
  88 radio and GNU Radio, caused by the program being unable to read the
  89 GSM data fast enough.  If you see a stream of 'O's from the terminal
  90 where you started scan-and-livemon, you need a give the process more
  91 CPU power.  Perhaps someone are able to optimize the code to a point
  92 where it become possible to set up RPi3 based GSM sniffers?  I tried
  93 using Raspbian instead of Debian, but there seem to be something wrong
  94 with GNU Radio on raspbian, causing glibc to abort().</p>
  95 </div>
  96
  97       <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/personvern">personvern</a>, <a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance</a>.</div>
  98
  99
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 105     <div id="sidebar">
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 109 <h2>Archive</h2>
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 201
 202 </ul></li>
 203
 204 <li>2015
 205 <ul>
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 228
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 230
 231 </ul></li>
 232
 233 <li>2014
 234 <ul>
 235
 236 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/01/">January (2)</a></li>
 237
 238 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/02/">February (3)</a></li>
 239
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 257
 258 <li><a href="http://people.skolelinux.org/pere/blog/archive/2014/12/">December (5)</a></li>
 259
 260 </ul></li>
 261
 262 <li>2013
 263 <ul>
 264
 265 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/01/">January (11)</a></li>
 266
 267 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/02/">February (9)</a></li>
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 282
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 284
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 286
 287 <li><a href="http://people.skolelinux.org/pere/blog/archive/2013/12/">December (3)</a></li>
 288
 289 </ul></li>
 290
 291 <li>2012
 292 <ul>
 293
 294 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
 295
 296 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (10)</a></li>
 297
 298 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/03/">March (17)</a></li>
 299
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 301
 302 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/05/">May (12)</a></li>
 303
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 305
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 307
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 309
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 311
 312 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/10/">October (17)</a></li>
 313
 314 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/11/">November (10)</a></li>
 315
 316 <li><a href="http://people.skolelinux.org/pere/blog/archive/2012/12/">December (7)</a></li>
 317
 318 </ul></li>
 319
 320 <li>2011
 321 <ul>
 322
 323 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/01/">January (16)</a></li>
 324
 325 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/02/">February (6)</a></li>
 326
 327 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/03/">March (6)</a></li>
 328
 329 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/04/">April (7)</a></li>
 330
 331 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/05/">May (3)</a></li>
 332
 333 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/06/">June (2)</a></li>
 334
 335 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/07/">July (7)</a></li>
 336
 337 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/08/">August (6)</a></li>
 338
 339 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/09/">September (4)</a></li>
 340
 341 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/10/">October (2)</a></li>
 342
 343 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/11/">November (3)</a></li>
 344
 345 <li><a href="http://people.skolelinux.org/pere/blog/archive/2011/12/">December (1)</a></li>
 346
 347 </ul></li>
 348
 349 <li>2010
 350 <ul>
 351
 352 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/01/">January (2)</a></li>
 353
 354 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/02/">February (1)</a></li>
 355
 356 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/03/">March (3)</a></li>
 357
 358 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/04/">April (3)</a></li>
 359
 360 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/05/">May (9)</a></li>
 361
 362 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/06/">June (14)</a></li>
 363
 364 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/07/">July (12)</a></li>
 365
 366 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/08/">August (13)</a></li>
 367
 368 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/09/">September (7)</a></li>
 369
 370 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/10/">October (9)</a></li>
 371
 372 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/11/">November (13)</a></li>
 373
 374 <li><a href="http://people.skolelinux.org/pere/blog/archive/2010/12/">December (12)</a></li>
 375
 376 </ul></li>
 377
 378 <li>2009
 379 <ul>
 380
 381 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/01/">January (8)</a></li>
 382
 383 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/02/">February (8)</a></li>
 384
 385 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/03/">March (12)</a></li>
 386
 387 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/04/">April (10)</a></li>
 388
 389 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/05/">May (9)</a></li>
 390
 391 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/06/">June (3)</a></li>
 392
 393 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/07/">July (4)</a></li>
 394
 395 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/08/">August (3)</a></li>
 396
 397 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/09/">September (1)</a></li>
 398
 399 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/10/">October (2)</a></li>
 400
 401 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/11/">November (3)</a></li>
 402
 403 <li><a href="http://people.skolelinux.org/pere/blog/archive/2009/12/">December (3)</a></li>
 404
 405 </ul></li>
 406
 407 <li>2008
 408 <ul>
 409
 410 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/11/">November (5)</a></li>
 411
 412 <li><a href="http://people.skolelinux.org/pere/blog/archive/2008/12/">December (7)</a></li>
 413
 414 </ul></li>
 415
 416 </ul>
 417
 418
 419
 420 <h2>Tags</h2>
 421 <ul>
 422
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 436
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 440
 441  <li><a href="http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (158)</a></li>
 442
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 444
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 446
 447  <li><a href="http://people.skolelinux.org/pere/blog/tags/dld">dld (17)</a></li>
 448
 449  <li><a href="http://people.skolelinux.org/pere/blog/tags/docbook">docbook (25)</a></li>
 450
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 458
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 460
 461  <li><a href="http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (9)</a></li>
 462
 463  <li><a href="http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (20)</a></li>
 464
 465  <li><a href="http://people.skolelinux.org/pere/blog/tags/h264">h264 (20)</a></li>
 466
 467  <li><a href="http://people.skolelinux.org/pere/blog/tags/intervju">intervju (42)</a></li>
 468
 469  <li><a href="http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (16)</a></li>
 470
 471  <li><a href="http://people.skolelinux.org/pere/blog/tags/kart">kart (20)</a></li>
 472
 473  <li><a href="http://people.skolelinux.org/pere/blog/tags/kodi">kodi (4)</a></li>
 474
 475  <li><a href="http://people.skolelinux.org/pere/blog/tags/ldap">ldap (9)</a></li>
 476
 477  <li><a href="http://people.skolelinux.org/pere/blog/tags/lego">lego (4)</a></li>
 478
 479  <li><a href="http://people.skolelinux.org/pere/blog/tags/lenker">lenker (8)</a></li>
 480
 481  <li><a href="http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (2)</a></li>
 482
 483  <li><a href="http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (1)</a></li>
 484
 485  <li><a href="http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (8)</a></li>
 486
 487  <li><a href="http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (42)</a></li>
 488
 489  <li><a href="http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (11)</a></li>
 490
 491  <li><a href="http://people.skolelinux.org/pere/blog/tags/norsk">norsk (304)</a></li>
 492
 493  <li><a href="http://people.skolelinux.org/pere/blog/tags/nuug">nuug (192)</a></li>
 494
 495  <li><a href="http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (35)</a></li>
 496
 497  <li><a href="http://people.skolelinux.org/pere/blog/tags/open311">open311 (2)</a></li>
 498
 499  <li><a href="http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (73)</a></li>
 500
 501  <li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (108)</a></li>
 502
 503  <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (2)</a></li>
 504
 505  <li><a href="http://people.skolelinux.org/pere/blog/tags/reactos">reactos (1)</a></li>
 506
 507  <li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
 508
 509  <li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (3)</a></li>
 510
 511  <li><a href="http://people.skolelinux.org/pere/blog/tags/robot">robot (11)</a></li>
 512
 513  <li><a href="http://people.skolelinux.org/pere/blog/tags/rss">rss (1)</a></li>
 514
 515  <li><a href="http://people.skolelinux.org/pere/blog/tags/ruter">ruter (7)</a></li>
 516
 517  <li><a href="http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (2)</a></li>
 518
 519  <li><a href="http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (55)</a></li>
 520
 521  <li><a href="http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (4)</a></li>
 522
 523  <li><a href="http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (5)</a></li>
 524
 525  <li><a href="http://people.skolelinux.org/pere/blog/tags/standard">standard (58)</a></li>
 526
 527  <li><a href="http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (6)</a></li>
 528
 529  <li><a href="http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (12)</a></li>
 530
 531  <li><a href="http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (55)</a></li>
 532
 533  <li><a href="http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (4)</a></li>
 534
 535  <li><a href="http://people.skolelinux.org/pere/blog/tags/usenix">usenix (2)</a></li>
 536
 537  <li><a href="http://people.skolelinux.org/pere/blog/tags/valg">valg (9)</a></li>
 538
 539  <li><a href="http://people.skolelinux.org/pere/blog/tags/verkidetfri">verkidetfri (15)</a></li>
 540
 541  <li><a href="http://people.skolelinux.org/pere/blog/tags/video">video (73)</a></li>
 542
 543  <li><a href="http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (4)</a></li>
 544
 545  <li><a href="http://people.skolelinux.org/pere/blog/tags/web">web (42)</a></li>
 546
 547 </ul>
 548
 549
 550     </div>
 551     <p style="text-align: right">
 552  Created by <a href="http://steve.org.uk/Software/chronicle">Chronicle v4.6</a>
 553 </p>
 554
 555   </body>
 556 </html>