Karsten, 08/21/2020 09:10 AM
This open source software allows the 'cracking' of A5/1 keys used to encrypt GSM 2G calls and SMS.
The cracking utility Kraken, developed by Frank A. Stevenson, is written in C++/python and runs on AMD GPUs or CPUs.
Kraken leverages rainbow tables that were computed as a community effort.
h3. Mailing list
A public mailing list for announcements and discussion can be found "here":http://lists.srlabs.de/cgi-bin/mailman/listinfo/a51 .
You may also file bugs and support requests through the "issue tracker":http://opensource.srlabs.de/projects/a51-decrypt/issues/new if they are of little relevance to the majority of the mailing list subscribers.
The (read only) Kraken git can be fetched with
git clone git://git.srlabs.de/kraken
h3. Rainbow tables
"Decryption is achieved with rainbow tables":https://srlabs.de/bites/decrypting-gsm/ , which can be downloaded through "BitTorrent":https://opensource.srlabs.de/projects/a51-decrypt/files
h3. Related projects
The A5/1 decryption was originally meant to be used with "Airprobe":http://airprobe.org), which allows interfacing with the radio waves with
the help of gnuradio.
Airprobe has, for most users, since been replaced by the cheaper "Osmocom phones":http://bb.osmocom.org
h3. [[A51|Further reading on A5/1 Cryptoanalysis]]