This RFC concisely describes known attacks against MD5 and
SHA-1 (which together are the ubiquitous hash algorithms
in current Internet protocols).
4270 Attacks on Cryptographic Hashes in Internet Protocols. P.
Hoffman, B. Schneier. November 2005. (Format: TXT=26641 bytes)
Scary, but important reading.
Ira McDonald (Musician / Software Architect)
Blue Roof Music / High North Inc
PO Box 221 Grand Marais, MI 49839
email: imcdonald at sharplabs.com