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Re: [pkix] DER encoding in RFC 3161

Peter Gutmann <pgut001@cs.auckland.ac.nz> Tue, 04 August 2020 10:09 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: Phillip Hallam-Baker <phill@hallambaker.com>, "mrex@sap.com" <mrex@sap.com>
CC: "pkix@ietf.org" <pkix@ietf.org>, Koichi Sugimoto <koichi.sugimoto=40globalsign.com@dmarc.ietf.org>
Thread-Topic: [pkix] DER encoding in RFC 3161
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Date: Tue, 04 Aug 2020 10:09:21 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/pkix/8hVv3N-F-iJCsEGL5ol8jZvYGUE>
Subject: Re: [pkix] DER encoding in RFC 3161
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Martin Rex <mrex@sap.com> writes:

>That installed base maps Certificate based on the certificate fingerprint.

Why is this a problem?  In order to make it "break horribly" you'd need to
deliberately re-encode the malleable parts of the certificate in a different
format.  Given the very widespread use of hash fingerprints to uniquely
identify data items I think people know how to work with them by now, the rule
being "don't gratuitously change the data being identified by the hash value".

Peter.

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