multiple subkeys and key transition

Ben McGinnes ben at
Fri Dec 10 01:07:17 CET 2010

On 10/12/10 10:57 AM, Robert J. Hansen wrote:
> 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.  :)

Excellent.  Thanks.


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