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Date: Wed, 05 Nov 2014 04:45:46 +0000
From: Alex Gaynor <>
Subject: Re: is MD5 finally dead?

As far as I can tell, HMAC doesn't actually require pre-image resistance,
it requires that the compression function used by the has be a PRF -- or at
least that's what the HMAC paper says. Are these two formulations


On Wed Nov 05 2014 at 8:42:59 PM Michael Samuel <> wrote:

> Hi,
> On 5 November 2014 15:21, Kurt Seifried <> wrote:
> >
> images-with-same-md5.html
> >
> > It seems like MD5 should probably be classed with DES as instant CVE
> > win, either now, or pretty soon....
> This is the same chosen-prefix attack that was used to forge
> certificates.  Using md5 in
> a collision-hostile environment is definitely CVE worthy, and has been
> for a while. (BTW,
> no CVE for rsync yet)
> In the case of an unknown-prefix, HMAC[1] or anything requiring a
> preimage, it's
> just hardening to use swap out MD5 (and SHA-1).
> [1] Unless you accidentally swap the key and data fields!

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