It sounds like they are guessing passwords rather than cracking keys. But is there any advantage in using a CELL processor for this?
AES, for example, is the encryption standard used by PGP's whole disk encryption. From
http://en.wikipedia.org/wiki/Brute_force_attack:
"AES permits the use of 256-bit keys. Breaking a symmetric 256-bit key by brute force requires 2128 times more computational power than a 128-bit key. A device that could check a billion billion (1018) AES keys per second would require about 3×1051 years to exhaust the 256-bit key space."
Hence my thought that they are not cracking keys.
"Your mother was a hamster, and your father smelt of elderberrys!" -- Monty Python and the Holy Grail