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Re: [saag] [Cfrg] Further MD5 breaks: Creating a rogue CAcertificate

"Timothy J. Miller" <tmiller@mitre.org> Mon, 05 January 2009 06:54 UTC

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Date: Wed, 31 Dec 2008 12:35:09 -0600
From: "Timothy J. Miller" <tmiller@mitre.org>
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To: Santosh Chokhani <SChokhani@cygnacom.com>
References: <08bb01c96ac7$1cd5a750$5680f5f0$@com> <E1LHplH-0006Xw-V6@wintermute01.cs.auckland.ac.nz> <FAD1CF17F2A45B43ADE04E140BA83D4893658D@scygexch1.cygnacom.com> <495B8D28.6070601@mitre.org> <FAD1CF17F2A45B43ADE04E140BA83D489365A4@scygexch1.cygnacom.com> <495BA5E9.8040305@pobox.com> <495BB0B9.9000807@pobox.com> <495BB5D7.7040106@drh-consultancy.demon.co.uk> <FAD1CF17F2A45B43ADE04E140BA83D489365CC@scygexch1.cygnacom.com>
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Cc: "ietf-pkix@imc.org" <ietf-pkix@imc.org>, Dr Stephen Henson <lists@drh-consultancy.demon.co.uk>, "cfrg@irtf.org" <cfrg@irtf.org>, "saag@ietf.org" <saag@ietf.org>, "ietf-smime@imc.org" <ietf-smime@imc.org>
Subject: Re: [saag] [Cfrg] Further MD5 breaks: Creating a rogue CAcertificate
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Santosh Chokhani wrote:
> I am a bit concerned about random goo when random goo is one of the
> things the attacker uses to cause collision.  This may limit human or
> machine's ability to discern mischief.

I don't see how, if the random goo is added by the CA.  It defeats 
chosen prefix attacks as a class.

-- Tim

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