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Re: [openpgp] Version 5 key and fingerprint proposal

Peter Gutmann <pgut001@cs.auckland.ac.nz> Thu, 16 March 2017 23:21 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: Derek Atkins <derek@ihtfp.com>, IETF OpenPGP <openpgp@ietf.org>
Thread-Topic: [openpgp] Version 5 key and fingerprint proposal
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Date: Thu, 16 Mar 2017 23:21:50 +0000
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References: <87varlou5m.fsf@wheatstone.g10code.de> <20170307230605.GA2@hashbang.sh> <87efy8ntcx.fsf@wheatstone.g10code.de> <20170309174531.GB2@hashbang.sh> <20170309184745.GC2@hashbang.sh> <CABcZeBMhpXy-e9Mtp8LwfqfAVW_ks3JBw1H2N3H_0c4gpQBqpg@mail.gmail.com> <DAC23A62-14BF-4AAA-8E52-09029B279E8F@icloud.com> <87varhculg.fsf@wheatstone.g10code.de> <2BC88897-B957-4E4E-B109-DFF4EFA14B4D@icloud.com> <87mvco40xf.fsf@wheatstone.g10code.de> <87mvclwjih.fsf@wheatstone.g10code.de>,<sjmr31xtf9r.fsf@securerf.ihtfp.org>
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Subject: Re: [openpgp] Version 5 key and fingerprint proposal
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Derek Atkins <derek@ihtfp.com> writes:

>I.e., it doesn't bother me if SHA2-256 is a fraction of a millisecond slower
>on a large system, but it's tens or hundreds of milliseconds faster on the
>constrained device.

+1.

Also, like AES' 256-bit option, I get the feeling that SHA-512 exists purely
for people who want their algorithms to go to 11.  It doesn't solve any
obvious problem that SHA-256 doesn't already address, while leading to serious
practical issues when you're required to attach e.g. a 64-byte MAC to 5 bytes
of SSL payload.

Peter.

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