I decided to create a new, separate project for all my GSM research. My goal is to sniff my own data, crack the key, and read the SMS I sent/listen to the voice call I made. I am still hesitating in terms of hardware to use between OsmocomBB phones (a lot better, more accurate hardware for voice especially) and rtl-sdr (much easier to use, and Â so far it already showed how awesome it is and how great capabilities it has).
Anyhow, for key cracking you need to have the a51_table files, which are available from torrents. Sadly I wasn’t able to find a correctly formatted file containing MD5 hashes for these 40 files, so I collected all the hashes from the a51 mailing list’s archives and put them in a format that could be used with the Linux utility ‘md5sum’ to automatically check integrity.
I will also commit a list containing exact sizes of the table files into this repository, so if you would not like to wait for md5sum you can just check the files based on size.