bk: Cool pretender: Very cool coderman: SMS not encrypted, GSM active MITM possible with ~5-10k in hardware (Nallatech/Xilinx DSP dev card, RF front ends, additional FPGA(s) for crypto) coderman: then snarf credentials and enjoy free cell service forever. coderman: Barkan, Biham, and Keller (thx rabbi) spent about $50k when they broke A5/X six ways to sunday. prices have dropped considerably since... coderman: (or maybe it was $200k, but they indicated it could be done with only $50k investment?) coderman: stock up on those cheap subsidized phones now! pretender: http://cryptome.org/gsm-spy.htm claims you can crack A5 in seconds with cheap hardware given enough ciphertext
