Jaerik said:
(5 points for anyone that gets the equation reference. Huge hint: a lot of modern cryptology relies on it, including the protocol that encrypts your ffxiah.com password.)
I'd be very tempted to say MD5 >.> Mostly because from what I've heard most passwords stashed in databases somewhere use MD5 because it's so easy to work with.
But I dunno, I'm not too well up on Cryptology's. MD5 or Rot13? >.>