Re: Crypographically Strong Software Distribution HOWTO

[Don Davis]

>> Hans Dobbertin found some weaknesses in MD5 in 1996.

> Also note that RFC 2104 on the HMAC construction used in IPSEC
> explicitly cites Dobbertin and says the attack does not apply:

this is because dobbertin's attack works only
against message-digest applications of md5;
his attack doesn't work against md5 MACs, ie,
when md5 is used to hash a symmetric key with
the plaintext.

but, i generally tell clients to use sha-1 even
for MACs, just to avoid confusing their customers.

                                - don davis, boston







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