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Re: [secdir] [Cfrg] ISE seeks help with some crypto drafts

Benjamin Kaduk <kaduk@mit.edu> Sun, 10 March 2019 19:10 UTC

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Date: Sun, 10 Mar 2019 14:10:27 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: Ted Krovetz <ted@krovetz.net>
CC: CFRG <cfrg@irtf.org>, "RFC ISE (Adrian Farrel)" <rfc-ise@rfc-editor.org>, secdir <secdir@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/secdir/txQhGKMWhgR4xQfRZm-EqwMbhbo>
Subject: Re: [secdir] [Cfrg] ISE seeks help with some crypto drafts
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On Sun, Mar 10, 2019 at 12:05:23PM -0700, Ted Krovetz wrote:
> 
> 
> > On Mar 10, 2019, at 11:29 AM, Benjamin Kaduk <kaduk@mit.edu> wrote:
> > 
> > failed to find a great deal of motivation for needing the new modes
> 
> I would like to remind everyone that OCB is not a "new mode". It is specified in RFC 7253. This work generalizes the specification -- without changing the 128-bit block case -- to allow other block cipher block lengths.

It's still a "distinct choice that a protocol designer (or user) picking a
cipher has available to choose from", which is where the perceived downside
of new things comes from.  My apologies for conflating the technical term
with the generic.

-Ben

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