DM <dont_spam_me@reply_to_group.instead> writes:

> Some md5, etc yoda would be able to confirm/deny that, or shed more
> light on it.

Based on mathematical functions they are. Deduce input from output
you cannot. To crack, every input try you must. Thus useful for
password storage they are!

For understanding, read this you may:

http://en.wikipedia.org/wiki/Hashing_function