Md5

MD5 is a cryptographic one-way hashing algorithm first described in RFC 1321 back in 1992.

MD5 is no longer recommended for use, following a presentation at the 2004 Crypto Conference that revealed hash collision problems with the algorithm. One replacement perhaps is SHA256.

This MD5 sum is infamous:

d41d8cd98f00b204e9800998ecf8427e

What is it? An empty file.

Salted MD5 passwords broken

With off the shelf hardware.. see {http://securityledger.com/new-25-gpu-monster-devours-passwords-in-seconds/ here] it's probably wise to use another cipher, perhaps bcrypt based on many rounds of blowfish.