Re: Main difference between PRP and PRF

Alex <alex33689@xxxxxxxxxxxxxx> writes:

On 22 Jul., 10:53, dwmal...@xxxxxxxxxxxx (David Malone) wrote:

This functions with this property are known as "injective" or
"one-to-one" and it has lots of useful implications:

For the PRF's it can't be guarantee because as far as I know they are
imlplemented using hash or hmac functions.
PRF's aren't "injective" because the different input paramters map to
the identical output value! Is this correct ??!!

Yep - PRF wouldn't usually be injective. A permutation would be.

David.
.