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6 <title>Petter Reinholdtsen: entries from September
2017</title>
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15 <a href=
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</a>
22 <h3>Entries from September
2017.
</h3>
26 <a href=
"http://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html">Easier recipe to observe the cell phones around you
</a>
32 <p>A little more than a month ago I wrote
33 <a href=
"http://people.skolelinux.org/pere/blog/Simpler_recipe_on_how_to_make_a_simple__7_IMSI_Catcher_using_Debian.html">how
34 to observe the SIM card ID (aka IMSI number) of mobile phones talking
35 to nearby mobile phone base stations using Debian GNU/Linux and a
36 cheap USB software defined radio
</a>, and thus being able to pinpoint
37 the location of people and equipment (like cars and trains) with an
38 accuracy of a few kilometer. Since then we have worked to make the
39 procedure even simpler, and it is now possible to do this without any
40 manual frequency tuning and without building your own packages.
</p>
42 <p>The
<a href=
"https://tracker.debian.org/pkg/gr-gsm">gr-gsm
</a>
43 package is now included in Debian testing and unstable, and the
44 IMSI-catcher code no longer require root access to fetch and decode
45 the GSM data collected using gr-gsm.
</p>
47 <p>Here is an updated recipe, using packages built by Debian and a git
48 clone of two python scripts:
</p>
52 <li>Start with a Debian machine running the Buster version (aka
55 <li>Run '
<tt>apt install gr-gsm python-numpy python-scipy
56 python-scapy
</tt>' as root to install required packages.
</li>
58 <li>Fetch the code decoding GSM packages using '
<tt>git clone
59 github.com/Oros42/IMSI-catcher.git
</tt>'.
</li>
61 <li>Insert USB software defined radio supported by GNU Radio.
</li>
63 <li>Enter the IMSI-catcher directory and run '
<tt>python
64 scan-and-livemon
</tt>' to locate the frequency of nearby base
65 stations and start listening for GSM packages on one of them.
</li>
67 <li>Enter the IMSI-catcher directory and run '
<tt>python
68 simple_IMSI-catcher.py
</tt>' to display the collected information.
</li>
72 <p>Note, due to a bug somewhere the scan-and-livemon program (actually
73 <a href=
"https://github.com/ptrkrysik/gr-gsm/issues/336">its underlying
74 program grgsm_scanner
</a>) do not work with the HackRF radio. It do
75 work with RTL
8232 and other similar USB radio receivers you can get
77 (
<a href=
"https://www.ebay.com/sch/items/?_nkw=rtl+2832">for example
78 from ebay
</a>), so for now the solution is to scan using the RTL radio
79 and only use HackRF for fetching GSM data.
</p>
81 <p>As far as I can tell, a cell phone only show up on one of the
82 frequencies at the time, so if you are going to track and count every
83 cell phone around you, you need to listen to all the frequencies used.
84 To listen to several frequencies, use the --numrecv argument to
85 scan-and-livemon to use several receivers. Further, I am not sure if
86 phones using
3G or
4G will show as talking GSM to base stations, so
87 this approach might not see all phones around you. I typically see
88 0-
400 IMSI numbers an hour when looking around where I live.
</p>
90 <p>I've tried to run the scanner on a
91 <a href=
"https://wiki.debian.org/RaspberryPi">Raspberry Pi
2 and
3
92 running Debian Buster
</a>, but the grgsm_livemon_headless process seem
93 to be too CPU intensive to keep up. When GNU Radio print 'O' to
94 stdout, I am told there it is caused by a buffer overflow between the
95 radio and GNU Radio, caused by the program being unable to read the
96 GSM data fast enough. If you see a stream of 'O's from the terminal
97 where you started scan-and-livemon, you need a give the process more
98 CPU power. Perhaps someone are able to optimize the code to a point
99 where it become possible to set up RPi3 based GSM sniffers? I tried
100 using Raspbian instead of Debian, but there seem to be something wrong
101 with GNU Radio on raspbian, causing glibc to abort().
</p>
107 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>.
112 <div class=
"padding"></div>
116 <a href=
"http://people.skolelinux.org/pere/blog/Datalagringsdirektivet_kaster_skygger_over_H_yre_og_Arbeiderpartiet.html">Datalagringsdirektivet kaster skygger over Høyre og Arbeiderpartiet
</a>
122 <p>For noen dager siden publiserte Jon Wessel-Aas en bloggpost om
123 «
<a href=
"http://www.uhuru.biz/?p=1821">Konklusjonen om datalagring som
124 EU-kommisjonen ikke ville at vi skulle få se
</a>». Det er en
125 interessant gjennomgang av EU-domstolens syn på snurpenotovervåkning
126 av befolkningen, som er klar på at det er i strid med
129 <p>Valgkampen går for fullt i Norge, og om noen få dager er siste
130 frist for å avgi stemme. En ting er sikkert, Høyre og Arbeiderpartiet
132 <a href=
"http://people.skolelinux.org/pere/blog/Datalagringsdirektivet_gj_r_at_Oslo_H_yre_og_Arbeiderparti_ikke_f_r_min_stemme_i__r.html">denne
133 gangen heller
</a>. Jeg har ikke glemt at de tvang igjennom loven som
134 skulle pålegge alle data- og teletjenesteleverandører å overvåke alle
135 sine kunder. En lov som er vedtatt, og aldri opphevet igjen.
</p>
137 <p>Det er tydelig fra diskusjonen rundt grenseløs digital overvåkning
138 (eller "Digital Grenseforsvar" som det kalles i Orvellisk nytale) at
139 hverken Høyre og Arbeiderpartiet har noen prinsipielle sperrer mot å
140 overvåke hele befolkningen, og diskusjonen så langt tyder på at flere
141 av de andre partiene heller ikke har det. Mange av
142 <a href=
"https://data.holderdeord.no/votes/1301946411e">de som stemte
143 for Datalagringsdirektivet i Stortinget
</a> (
64 fra Arbeiderpartiet,
144 25 fra Høyre) er fortsatt aktive og argumenterer fortsatt for å radere
145 vekk mer av innbyggernes privatsfære.
</p>
147 <p>Når myndighetene demonstrerer sin mistillit til folket, tror jeg
148 folket selv bør legge litt innsats i å verne sitt privatliv, ved å ta
149 i bruk ende-til-ende-kryptert kommunikasjon med sine kjente og kjære,
150 og begrense hvor mye privat informasjon som deles med uvedkommende.
151 Det er jo ingenting som tyder på at myndighetene kommer til å være vår
153 <a href=
"http://people.skolelinux.org/pere/blog/How_to_talk_with_your_loved_ones_in_private.html">Det
154 er mange muligheter
</a>. Selv har jeg litt sans for
155 <a href=
"https://ring.cx/">Ring
</a>, som er basert på p2p-teknologi
156 uten sentral kontroll, er fri programvare, og støtter meldinger, tale
157 og video. Systemet er tilgjengelig ut av boksen fra
158 <a href=
"https://tracker.debian.org/pkg/ring">Debian
</a> og
159 <a href=
"https://launchpad.net/ubuntu/+source/ring">Ubuntu
</a>, og det
160 finnes pakker for Android, MacOSX og Windows. Foreløpig er det få
161 brukere med Ring, slik at jeg også bruker
162 <a href=
"https://signal.org/">Signal
</a> som nettleserutvidelse.
</p>
168 Tags:
<a href=
"http://people.skolelinux.org/pere/blog/tags/dld">dld
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/personvern">personvern
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance
</a>,
<a href=
"http://people.skolelinux.org/pere/blog/tags/valg">valg
</a>.
173 <div class=
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</a></li>
462 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/bootsystem">bootsystem (
16)
</a></li>
464 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/bsa">bsa (
2)
</a></li>
466 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/chrpath">chrpath (
2)
</a></li>
468 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/debian">debian (
152)
</a></li>
470 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/debian edu">debian edu (
158)
</a></li>
472 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/debian-handbook">debian-handbook (
4)
</a></li>
474 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/digistan">digistan (
10)
</a></li>
476 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/dld">dld (
17)
</a></li>
478 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/docbook">docbook (
24)
</a></li>
480 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/drivstoffpriser">drivstoffpriser (
4)
</a></li>
482 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/english">english (
352)
</a></li>
484 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (
23)
</a></li>
486 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/fildeling">fildeling (
12)
</a></li>
488 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/freeculture">freeculture (
30)
</a></li>
490 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/freedombox">freedombox (
9)
</a></li>
492 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/frikanalen">frikanalen (
18)
</a></li>
494 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/h264">h264 (
20)
</a></li>
496 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/intervju">intervju (
42)
</a></li>
498 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/isenkram">isenkram (
15)
</a></li>
500 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/kart">kart (
20)
</a></li>
502 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ldap">ldap (
9)
</a></li>
504 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/lenker">lenker (
8)
</a></li>
506 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/lsdvd">lsdvd (
2)
</a></li>
508 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ltsp">ltsp (
1)
</a></li>
510 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/mesh network">mesh network (
8)
</a></li>
512 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/multimedia">multimedia (
39)
</a></li>
514 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/nice free software">nice free software (
9)
</a></li>
516 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/norsk">norsk (
292)
</a></li>
518 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/nuug">nuug (
189)
</a></li>
520 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/offentlig innsyn">offentlig innsyn (
33)
</a></li>
522 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/open311">open311 (
2)
</a></li>
524 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/opphavsrett">opphavsrett (
64)
</a></li>
526 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/personvern">personvern (
103)
</a></li>
528 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/raid">raid (
1)
</a></li>
530 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/reactos">reactos (
1)
</a></li>
532 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/reprap">reprap (
11)
</a></li>
534 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rfid">rfid (
3)
</a></li>
536 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/robot">robot (
10)
</a></li>
538 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/rss">rss (
1)
</a></li>
540 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/ruter">ruter (
5)
</a></li>
542 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/scraperwiki">scraperwiki (
2)
</a></li>
544 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sikkerhet">sikkerhet (
53)
</a></li>
546 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sitesummary">sitesummary (
4)
</a></li>
548 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/skepsis">skepsis (
5)
</a></li>
550 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/standard">standard (
55)
</a></li>
552 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stavekontroll">stavekontroll (
6)
</a></li>
554 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/stortinget">stortinget (
12)
</a></li>
556 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/surveillance">surveillance (
51)
</a></li>
558 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/sysadmin">sysadmin (
3)
</a></li>
560 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/usenix">usenix (
2)
</a></li>
562 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/valg">valg (
9)
</a></li>
564 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/video">video (
59)
</a></li>
566 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/vitenskap">vitenskap (
4)
</a></li>
568 <li><a href=
"http://people.skolelinux.org/pere/blog/tags/web">web (
40)
</a></li>
574 <p style=
"text-align: right">
575 Created by
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