multiple subkeys and key transition

Robert J. Hansen rjh at
Fri Dec 10 00:57:43 CET 2010

On 12/9/2010 6:49 PM, Ben McGinnes wrote:
> Just to clarify, does this mean that SHA-256 or 512 (or whatever)
> truncated to 160-bits prevent the potential collision attacks that
> might be able to be launched against SHA-1?

Correct.  Truncating a hash does not introduce any flaws in the
algorithm.  If you truncate a bad hash, you now have a truncated bad
hash.  Truncate a good hash and you have a truncated good hash.  :)

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