Re: MD5 Alive?



Ertugrul Soeylemez wrote:


MD5 does not, and in fact cannot, guarantee uniqueness. If, like stated
above, MD5 with the same input space as output space is a bijection,
then it does guarantee uniqueness for inputs of exactly 128 bits, but we
don't know that even for the original MD5.


Actually we should assume quite the contrary: If MD5 is a pseudorandom function, than it's a pseudorandom mapping and therefore about 1/e of all outputs will not occur, and about the same number will be collisions.
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