Date: Wed, 05 Nov 2014 04:45:46 +0000 From: Alex Gaynor <alex.gaynor@...il.com> To: oss-security@...ts.openwall.com 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 equivalent? Alex On Wed Nov 05 2014 at 8:42:59 PM Michael Samuel <mik@...net.net> wrote: > Hi, > > On 5 November 2014 15:21, Kurt Seifried <kseifried@...hat.com> wrote: > > http://natmchugh.blogspot.co.uk/2014/10/how-i-created-two- > 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 or anything requiring a > preimage, it's > just hardening to use swap out MD5 (and SHA-1). > >  Unless you accidentally swap the key and data fields! >
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