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Karsten, 09/22/2016 10:47 AM

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h3. Overview
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This open source software allows the 'cracking' of A5/1 keys used to secure GSM 2G calls and SMS.
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The cracking unitity Kraken, developed by Frank A. Stevenson, is written in C++/python and targets AMD (ATI) GPUs and CPUs. 
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h3. Mailing list
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A public mailing list for announcements and discussion can be found "here":http://lists.srlabs.de/cgi-bin/mailman/listinfo/a51 .
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Please fill bugs and support requests through the "issue tracker":http://opensource.srlabs.de/projects/a51-decrypt/issues/new as they may be of little relevance to the majority of the mailing list subscribers.
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h3. Code
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The (read only) Kraken git can be fetched with 
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<pre>
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git clone git://git.srlabs.de/kraken
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</pre>
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h3. Related projects
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The A5/1 decryption was originally meant to be used with "Airprobe":http://airprobe.org), which allows interfacing with the radio waves with
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the help of gnuradio.
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Airprobe has, for most users, since been replaced by the cheaper "Osmocom phones":http://bb.osmocom.org
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h3. Further reading
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[[A51|Cryptoanalysis in greater detail]]