Password entropy
Joe Thomas
jthomas at access.digex.net
Tue Jul 5 20:18:10 PDT 1994
On Mon, 4 Jul 1994 wcs at anchor.ho.att.com wrote:
> On the other hand, collisions are infrequent - the probability of a
> pair of numbers having the same MD5 value is presumed to be 2**-128,
> and the usual birthday paradox calculations apply, so you'll probably
> find one if you take 2**64 random samples.
Minor quibble: It might be better to say that you'll probably *have* one
if you take 2**64 random samples. Finding the pair would be pretty hard,
and you'd need a lot of storage in the meantime.
Joe
More information about the cypherpunks-legacy
mailing list