collision vs. preimage attacks: policy for signing data created by others

[Hauke Laging]

Am Do 04.10.2012, 10:51:57 schrieb spam man:
> So the question is...
> 
> 1.) I have two different messages that have the same hash value (a
> collision).
>            hash("foo") = abcdefg
>            hash("bar") = abcdefg
> 
> 2.) Now you want to append identical new data to the messages and see if
> the new hashes would still be collisions?
>           hash("foo and here are some more words") = tuvwxyz
>           hash("bar and here are some more words") = tuvwxyz
> 
> Is this your question?

Yes.
-- 
☺
PGP: D44C 6A5B 71B0 427C CED3 025C BD7D 6D27 ECCB 5814
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