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

"Valery Smyslov" <smyslov.ietf@gmail.com> Mon, 11 March 2019 08:07 UTC

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From: "Valery Smyslov" <smyslov.ietf@gmail.com>
To: "'Benjamin Kaduk'" <kaduk@mit.edu>, "'Ted Krovetz'" <ted@krovetz.net>
Cc: "'CFRG'" <cfrg@irtf.org>, "'RFC ISE \(Adrian Farrel\)'" <rfc-ise@rfc-editor.org>, "'secdir'" <secdir@ietf.org>
References: <1d8de489fc976b63a911573300a431d4.squirrel@www.amsl.com> <alpine.LRH.2.21.1903081227200.30421@bofh.nohats.ca> <CAHOTMVLtjVxZNy3bFRn09xH+cOw+tPi2CL3BkaQuJEqxAzGOJg@mail.gmail.com> <edca701b-21f3-c80c-d754-fc333f1e2e04@cs.tcd.ie> <20190310182935.GE8182@kduck.mit.edu> <B876B124-7EDE-4E20-A878-3AAD3FA074BC@krovetz.net> <20190310191026.GF8182@kduck.mit.edu>
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Date: Mon, 11 Mar 2019 11:07:22 +0300
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Subject: Re: [Cfrg] [secdir] ISE seeks help with some crypto drafts
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Hi Ben,

> > 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.

I agree that having more options generally complicates protocol designer's life.
Unless the choices have really different properties (it terms of security, performance, 
resources consumption etc.) which are clearly explained, so that 
the designer can make a conscious choice.

Regards,
Valery.

> -Ben
> 
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> wiki: http://tools.ietf.org/area/sec/trac/wiki/SecDirReview