X-Git-Url: http://pere.pagekite.me/gitweb/homepage.git/blobdiff_plain/cb2bffc9f0c093d20f059990477781700cd1f6a8..4b64f017f4616dddd8864d4d209886918fba659e:/blog/archive/2017/09/09.rss

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@@ -6,6 +6,65 @@
                 <link>http://people.skolelinux.org/pere/blog/</link>
 
 	
+	<item>
+		<title>Visualizing GSM radio chatter using gr-gsm and Hopglass</title>
+		<link>http://people.skolelinux.org/pere/blog/Visualizing_GSM_radio_chatter_using_gr_gsm_and_Hopglass.html</link>        
+		<guid isPermaLink="true">http://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>&lt;p&gt;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.&lt;/p&gt;
+
+&lt;p&gt;I am very happy to report that we managed to get something
+visualizing this information up and running for
+&lt;a href=&quot;http://norwaymakers.org/osf17&quot;&gt;Oslo Skaperfestival 2017&lt;/a&gt;
+(Oslo Makers Festival) taking place today and tomorrow at Deichmanske
+library.  The solution is based on the
+&lt;a href=&quot;http://people.skolelinux.org/pere/blog/Easier_recipe_to_observe_the_cell_phones_around_you.html&quot;&gt;simple
+recipe for listening to GSM chatter&lt;/a&gt; I posted a few days ago, and
+will show up at the stand of &lt;a href=&quot;http://sonen.ifi.uio.no/&quot;&gt;Åpen
+Sone from the Computer Science department of the University of
+Oslo&lt;/a&gt;.  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.&lt;/p&gt;
+
+&lt;p&gt;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
+&lt;a href=&quot;https://github.com/marlow925/hopglass&quot;&gt;English version of
+Hopglass&lt;/a&gt;.  A fairly powerfull machine is needed as the
+grgsm_livemon_headless processes from
+&lt;a href=&quot;https://tracker.debian.org/pkg/gr-gsm&quot;&gt;gr-gsm&lt;/a&gt; converting
+the radio signal to data packages is quite CPU intensive.&lt;/p&gt;
+					
+&lt;p&gt;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
+&lt;a href=&quot;https://github.com/petterreinholdtsen/IMSI-catcher/tree/meshviewer-output&quot;&gt;patches
+in my meshviewer-output branch&lt;/a&gt;.  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
+&lt;a href=&quot;https://github.com/Oros42/IMSI-catcher/issues/14&quot;&gt;the github
+issue for the topic&lt;/a&gt;.
+
+&lt;p&gt;If this sound interesting, visit the stand at the festival!&lt;/p&gt;
+</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>        
@@ -53,7 +112,7 @@ clone of two python scripts:&lt;/p&gt;
 
 &lt;p&gt;Note, due to a bug somewhere the scan-and-livemon program (actually
 &lt;a href=&quot;https://github.com/ptrkrysik/gr-gsm/issues/336&quot;&gt;its underlying
-program grgsm_scanner&lt;/a&gt;) do not work with the HackRF radio.  It do
+program grgsm_scanner&lt;/a&gt;) do not work with the HackRF radio.  It does
 work with RTL 8232 and other similar USB radio receivers you can get
 very cheaply
 (&lt;a href=&quot;https://www.ebay.com/sch/items/?_nkw=rtl+2832&quot;&gt;for example