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

Benjamin Kaduk <kaduk@mit.edu> Sun, 10 March 2019 18:29 UTC

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Date: Sun, 10 Mar 2019 13:29:35 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>
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/4WhebjJz02WUhiqXiM8PrB4NGCI>
Subject: Re: [secdir] [Cfrg] ISE seeks help with some crypto drafts
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On Fri, Mar 08, 2019 at 07:14:56PM +0000, Stephen Farrell wrote:
> 
> FWIW, I'd prefer have fewer and not more modes of operation
> documented. I'm not aware of a need for what this draft
> appears to specify (based on reading just the abstract). I
> also agree the OCB IPR situation isn't clear (IIRC more than
> just Rogaway's IPR was involved).
> 

My reading also failed to find a great deal of motivation for needing the
new modes.

I also found it interesting that the "wideblock" draft also specifies
narrow blocks, and that we've had some contentious discussions in the I*TF
in the past about narrow-block ciphers.

We always need to balance the flexibility of having specifications for new
modes against the risk to interoperability of having too many modes.  Given
what's in these documents at present, my personal sense is that the
tradeoff weighs slightly against publishing, but there are many things that
could shift that balance.

-Ben

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