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Re: [openpgp] Fingerprint schemes versus what to fingerprint

Peter Gutmann <pgut001@cs.auckland.ac.nz> Mon, 11 April 2016 15:41 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: Derek Atkins <derek@ihtfp.com>
Thread-Topic: [openpgp] Fingerprint schemes versus what to fingerprint
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Date: Mon, 11 Apr 2016 15:41:02 +0000
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References: <43986BDA-010F-4DBF-8989-53E71B74E66A@gmail.com> <20151110021943.GH3896@vauxhall.crustytoothpaste.net> <72665D15-F685-41F6-A477-8E65DBBC5A04@gmail.com> <9A043F3CF02CD34C8E74AC1594475C73F4C42AC4@uxcn10-5.UoA.auckland.ac.nz>, <sjm1t6c40uy.fsf@securerf.ihtfp.org>
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Cc: "openpgp@ietf.org" <openpgp@ietf.org>, Bryan Ford <brynosaurus@gmail.com>
Subject: Re: [openpgp] Fingerprint schemes versus what to fingerprint
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Derek Atkins <derek@ihtfp.com> writes:

>3) You have a smart card with raw key material and want to see which
>   OpenPGP keys are there. 

That's PKCS #11, which means pretty much all crypto hardware that uses a
standardised interface.

>*) Other use cases???

You have keys stored in a non-PGP format.  It makes keys from anywhere else
pretty much unusable for PGP because you can't look them up.

>It means that if someone reuses the key material then you cannot
>differentiate the original from the subsequent certificate.

That assumes you re-use the same key over and over, rather than just
generating a fresh key when you need one.  That's X.509 practice, not PGP.

Peter.

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