Current cryptograhy tecniques are 'impossible' to crack, it's just a question of using a long enough key.

I heard that to crack a 4000-something length key for the RSA-encrytpion algorithm, you would need all excisting computer power in the world. And it would take the rest of the universe' liftetime to do so. And even then, you couldn't be sure of cracking it, but maybe...

But of course there is only a question of computer power, if the computers are powerful enough, it's no big deal really.... In 1997 a 128 bit RSA was cracked by a program which united lots of pc's around the world. Sort of like the SETI screen-saver. And that too, was supposed to be 'unbreakable'.