Hi

> > (And, they can't be "decrypted")
> Really? I'm not an encryptor or anything but if the encryption method is

known (which it is), I would have thought brute force could do it reasonably
easily .. no?

No.
Brute force is about guessing and encrypting, but not decrypting. You could
find another password, wich leads to the same encrypted string, but is
totally different to the original password. This is called a collision of
the hash. Collisions should be very rare though.
Anyway, finding a password, wich matches a hash with some salt, does not
mean, that it will match using another salt.

Regards,
Steffen