Re: [openpgp] SHA3 algorithm ids.

Derek Atkins <derek@ihtfp.com> Thu, 13 August 2015 13:32 UTC

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From: Derek Atkins <derek@ihtfp.com>
To: Phillip Hallam-Baker <phill@hallambaker.com>
References: <87y4hmi19i.fsf@vigenere.g10code.de> <7540C7A9-2830-4A63-8310-B684796DA279@nohats.ca> <55C681FC.9010100@iang.org> <sjma8tztbgo.fsf@securerf.ihtfp.org> <CAMm+Lwj7SxXTn+KD-eQSeZHwJB36tCgD1t0bodVsp3ovOaZ8mw@mail.gmail.com> <9A043F3CF02CD34C8E74AC1594475C73F4AD7C72@uxcn10-5.UoA.auckland.ac.nz> <CAMm+LwifPNxyj1LLA-k+8K=mmEztS42E2kcEfGFObPc0R2xvMQ@mail.gmail.com> <sjm7fp0sh6z.fsf@securerf.ihtfp.org> <CAMm+LwhHeaEYT2xZ8=3j7bhF6TeLPFUddek7C3_Z3-fYNUaeoA@mail.gmail.com>
Date: Thu, 13 Aug 2015 09:32:44 -0400
In-Reply-To: <CAMm+LwhHeaEYT2xZ8=3j7bhF6TeLPFUddek7C3_Z3-fYNUaeoA@mail.gmail.com> (Phillip Hallam-Baker's message of "Wed, 12 Aug 2015 11:42:51 -0400")
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Cc: IETF OpenPGP <openpgp@ietf.org>, Derek Atkins <derek@ihtfp.com>, ianG <iang@iang.org>, Peter Gutmann <pgut001@cs.auckland.ac.nz>
Subject: Re: [openpgp] SHA3 algorithm ids.
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Phillip Hallam-Baker <phill@hallambaker.com>; writes:

>     So let's not assume that these low-end processors are going away, please?
>
> Well the constraint on processing is easing up due to the move from RSA to ECC.

Sure, it reduces computation time from tens of seconds down to ones of
seconds.  ;)

> And for the amount of data going though one of these processors, the choice of
> AES or DES doesn't make much of a difference. These things don't have to
> communicate very fast.
>
> The thing that gets really uncomfortable is dealing with the amount of memory
> available. Quite a few of the embedded chips have even less RAM than the
> Commodore PET I started with when 32KB was the large machine. 

Oh, yeah.  Some of the environments I work in have like 2-4KB of RAM!

> Yes, these chips are not going away any time soon. The number of chips being
> made with 6502 based cores has increased every year since the 80s. But the
> problem with the chips isn't just that they are slow.

I'm not seeing 6502, but I am seeing a lot of 8051.

-derek

-- 
       Derek Atkins                 617-623-3745
       derek@ihtfp.com             www.ihtfp.com
       Computer and Internet Security Consultant