yablacky, while idea of using IMSI as an de-facto key for truecrypt - isn't it offering too low security? It's numbers only - I don't have hard data with me, but bruteforcing it would be orders of magnitude easier, than any TrueCrypt password should be - yep?

Isn't it becoming security through obscurity (i.e. relying on fact, that attacker doesn't know - usually - way used to deliver password from PIN and IMSI)?

Take this with grain of salt, as I don't know details yet

/Estel