bugtraq - RE: SHA-1 broken

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Message-ID: <1108921583.29693.35.camel@localhost>
Date: Sun, 20 Feb 2005 11:46:23 -0600
From: Frank Knobbe <frank@...bbe.us>
To: "Scovetta, Michael V" <Michael.Scovetta@...com>
Cc: Kent Borg <kentborg@...g.org>, Gadi Evron <gadi@...ila.gov.il>,
	bugtraq@...urityfocus.com
Subject: RE: SHA-1 broken

On Thu, 2005-02-17 at 16:34 -0500, Scovetta, Michael V wrote:
> [...] And due to recent discoveries, we can
> push those down to 2**50 and 2**55 respectively. Breaking a composition
> would still take on the order of 2**55 (the harder of the two)

If the two algorithms are different, finding a collision in one of them
does not deliver a working collision in the other, no? Don't you have to
find a "common" collision between the two? Wouldn't that require an
effort of 2**(50+55)?

Regards,
Frank


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