Re: Hash functions and streaming
From: Volker Birk (bumens_at_dingens.org)
Date: 10/30/05
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Date: 30 Oct 2005 15:01:07 +0200
frank <francis.moore@gmail.com> wrote:
> I have just heard (although apparently it's old news) that the SHA-1
> algorithm
> has been fundamentally broken.
Yes. You could use RIPEMD-160 instead, or use a well known block cipher
in CBC mode and use the last block of it as a hash.
> I don't really understand what problem is caused by someone finding a
> collision.
Trying to be short:
The security of hash functions consists of preventing attackers from being
able to provoke collisions.
If attackers can do this, then there is no security left at all with a hash
function.
Yours,
VB.
--
"Ich bin ein freier Mensch und werde jetzt von meinen Freiheitsrechten
Gebrauch machen - und zwar ausgiebig - natürlich nur in dem Rahmen, den
Otto Schily mir noch zur Verfügung stellt."
Wolfgang Clement am 10.10.05 als Noch-Superminister
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