<channel>
<title>Petter Reinholdtsen - Entries from September 2017</title>
<description>Entries from September 2017</description>
- <link>http://people.skolelinux.org/pere/blog/</link>
+ <link>https://people.skolelinux.org/pere/blog/</link>
+ <item>
+ <title>Visualizing GSM radio chatter using gr-gsm and Hopglass</title>
+ <link>https://people.skolelinux.org/pere/blog/Visualizing_GSM_radio_chatter_using_gr_gsm_and_Hopglass.html</link>
+ <guid isPermaLink="true">https://people.skolelinux.org/pere/blog/Visualizing_GSM_radio_chatter_using_gr_gsm_and_Hopglass.html</guid>
+ <pubDate>Fri, 29 Sep 2017 10:30:00 +0200</pubDate>
+ <description><p>Every mobile phone announce its existence over radio to the nearby
+mobile cell towers. And this radio chatter is available for anyone
+with a radio receiver capable of receiving them. Details about the
+mobile phones with very good accuracy is of course collected by the
+phone companies, but this is not the topic of this blog post. The
+mobile phone radio chatter make it possible to figure out when a cell
+phone is nearby, as it include the SIM card ID (IMSI). By paying
+attention over time, one can see when a phone arrive and when it leave
+an area. I believe it would be nice to make this information more
+available to the general public, to make more people aware of how
+their phones are announcing their whereabouts to anyone that care to
+listen.</p>
+
+<p>I am very happy to report that we managed to get something
+visualizing this information up and running for
+<a href="http://norwaymakers.org/osf17">Oslo Skaperfestival 2017</a>
+(Oslo Makers Festival) taking place today and tomorrow at Deichmanske
+library. The solution is based on the
+<a href="https://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html">simple
+recipe for listening to GSM chatter</a> I posted a few days ago, and
+will show up at the stand of <a href="http://sonen.ifi.uio.no/">Åpen
+Sone from the Computer Science department of the University of
+Oslo</a>. The presentation will show the nearby mobile phones (aka
+IMSIs) as dots in a web browser graph, with lines to the dot
+representing mobile base station it is talking to. It was working in
+the lab yesterday, and was moved into place this morning.</p>
+
+<p>We set up a fairly powerful desktop machine using Debian
+Buster/Testing with several (five, I believe) RTL2838 DVB-T receivers
+connected and visualize the visible cell phone towers using an
+<a href="https://github.com/marlow925/hopglass">English version of
+Hopglass</a>. A fairly powerfull machine is needed as the
+grgsm_livemon_headless processes from
+<a href="https://tracker.debian.org/pkg/gr-gsm">gr-gsm</a> converting
+the radio signal to data packages is quite CPU intensive.</p>
+
+<p>The frequencies to listen to, are identified using a slightly
+patched scan-and-livemon (to set the --args values for each receiver),
+and the Hopglass data is generated using the
+<a href="https://github.com/petterreinholdtsen/IMSI-catcher/tree/meshviewer-output">patches
+in my meshviewer-output branch</a>. For some reason we could not get
+more than four SDRs working. There is also a geographical map trying
+to show the location of the base stations, but I believe their
+coordinates are hardcoded to some random location in Germany, I
+believe. The code should be replaced with code to look up location in
+a text file, a sqlite database or one of the online databases
+mentioned in
+<a href="https://github.com/Oros42/IMSI-catcher/issues/14">the github
+issue for the topic</a>.
+
+<p>If this sound interesting, visit the stand at the festival!</p>
+</description>
+ </item>
+
<item>
<title>Easier recipe to observe the cell phones around you</title>
- <link>http://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html</guid>
+ <link>https://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html</link>
+ <guid isPermaLink="true">https://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html</guid>
<pubDate>Sun, 24 Sep 2017 08:30:00 +0200</pubDate>
<description><p>A little more than a month ago I wrote
-<a href="http://people.skolelinux.org/pere/blog/Simpler_recipe_on_how_to_make_a_simple__7_IMSI_Catcher_using_Debian.html">how
+<a href="https://people.skolelinux.org/pere/blog/Simpler_recipe_on_how_to_make_a_simple__7_IMSI_Catcher_using_Debian.html">how
to observe the SIM card ID (aka IMSI number) of mobile phones talking
to nearby mobile phone base stations using Debian GNU/Linux and a
cheap USB software defined radio</a>, and thus being able to pinpoint
<p>Note, due to a bug somewhere the scan-and-livemon program (actually
<a href="https://github.com/ptrkrysik/gr-gsm/issues/336">its underlying
-program grgsm_scanner</a>) do not work with the HackRF radio. It do
+program grgsm_scanner</a>) do not work with the HackRF radio. It does
work with RTL 8232 and other similar USB radio receivers you can get
very cheaply
(<a href="https://www.ebay.com/sch/items/?_nkw=rtl+2832">for example
<item>
<title>Datalagringsdirektivet kaster skygger over Høyre og Arbeiderpartiet</title>
- <link>http://people.skolelinux.org/pere/blog/Datalagringsdirektivet_kaster_skygger_over_H_yre_og_Arbeiderpartiet.html</link>
- <guid isPermaLink="true">http://people.skolelinux.org/pere/blog/Datalagringsdirektivet_kaster_skygger_over_H_yre_og_Arbeiderpartiet.html</guid>
+ <link>https://people.skolelinux.org/pere/blog/Datalagringsdirektivet_kaster_skygger_over_H_yre_og_Arbeiderpartiet.html</link>
+ <guid isPermaLink="true">https://people.skolelinux.org/pere/blog/Datalagringsdirektivet_kaster_skygger_over_H_yre_og_Arbeiderpartiet.html</guid>
<pubDate>Thu, 7 Sep 2017 21:35:00 +0200</pubDate>
<description><p>For noen dager siden publiserte Jon Wessel-Aas en bloggpost om
«<a href="http://www.uhuru.biz/?p=1821">Konklusjonen om datalagring som
<p>Valgkampen går for fullt i Norge, og om noen få dager er siste
frist for å avgi stemme. En ting er sikkert, Høyre og Arbeiderpartiet
får ikke min stemme
-<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
+<a href="https://people.skolelinux.org/pere/blog/Datalagringsdirektivet_gj_r_at_Oslo_H_yre_og_Arbeiderparti_ikke_f_r_min_stemme_i__r.html">denne
gangen heller</a>. Jeg har ikke glemt at de tvang igjennom loven som
skulle pålegge alle data- og teletjenesteleverandører å overvåke alle
sine kunder. En lov som er vedtatt, og aldri opphevet igjen.</p>
og begrense hvor mye privat informasjon som deles med uvedkommende.
Det er jo ingenting som tyder på at myndighetene kommer til å være vår
privatsfære.
-<a href="http://people.skolelinux.org/pere/blog/How_to_talk_with_your_loved_ones_in_private.html">Det
+<a href="https://people.skolelinux.org/pere/blog/How_to_talk_with_your_loved_ones_in_private.html">Det
er mange muligheter</a>. Selv har jeg litt sans for
<a href="https://ring.cx/">Ring</a>, som er basert på p2p-teknologi
uten sentral kontroll, er fri programvare, og støtter meldinger, tale
projects / homepage.git / blobdiff