Re: [openpgp] Pull request for AEAD encrypted data packet with GCM

Stephen Farrell <stephen.farrell@cs.tcd.ie> Tue, 14 February 2017 01:24 UTC

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To: Jon Callas <joncallas@icloud.com>, "brian m. carlson" <sandals@crustytoothpaste.net>
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From: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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Date: Tue, 14 Feb 2017 01:24:24 +0000
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Subject: Re: [openpgp] Pull request for AEAD encrypted data packet with GCM
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Just on one point...

On 14/02/17 01:09, Jon Callas wrote:
> We all really want to use OCB. If you look at
> <http://web.cs.ucdavis.edu/~rogaway/ocb/ocb-faq.htm> which is
> Rogaway's page on it. While it is patented, there are some broad
> license grants.

A recurring issue with OCB in other contexts has been that it
it not only Rogaway's IPR that is at issue. Despite (what I
think is) his very flexible and reasonable way of handling his
own IPR, and even his efforts to get others to play ball, there
are multiple other parties involved, not all of whom are IIUC
equally reasonable (according to my personal view of what's
reasonable).

I don't know that that situation has resolved itself favourably
in any case to date. I'd be happy if it had though, so please
do follow up this with good news, if such exists.

This issue was discussed on both the CFRG and TLS lists, maybe
a year or two ago, so interested folks would benefit from
checking those archives for OCB related threads.

Cheers,
S.

PS: Note that I'm not stating any opinion pro- or contra- GCM
nor any other AEAD construct here.