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Re: ESP transform with RC5

To: touch@isi.edu, sommerfeld@apollo.hp.com, rgm3@is.chrysler.com
Subject: Re: ESP transform with RC5
From: touch@isi.edu
Date: Mon, 18 Mar 1996 13:52:33 -0800
Cc: baldwin@rsa.com, ipsec@ans.net, bretth@newbridge.com, rivest@theory.lcs.mit.edu, tim@rsa.com
MMDF-Warning: Parse error in original version of preceding line at neptune.TIS.COM
Posted-Date: Mon, 18 Mar 1996 13:52:33 -0800
Sender: ipsec-request@neptune.tis.com

> From: Robert Moskowitz <rgm3@is.chrysler.com>
> Subject: Re: ESP transform with RC5
> 
> At 10:33 AM 3/18/96 -0800, touch@ISI.EDU wrote:
> 
> >> ~1995 or thereabouts.  This is a *very* new cipher, so it's not
> >> something I'd actually want to implement or use until it's had a
> >> lot more shakeout time.
> >> 
> >
> >FYI - the algorithm is based on data-dependent rotates.
> >Not to beat a dead horse, but rotates can take anywhere
> >from 3-5 operations on a RISC (which typically don't
> >have rotates), and data-dependent rotates can double that.
> 
> Joe,
> 
> Sorry for my inability to parse your words, but
> 
> Are you saying that:
> 
> A) RC5 is not high performance on a RISC

This.
 
I suspect it is just "not high performance", period.

Joe
----------------------------------------------------------------------
Joe Touch - touch@isi.edu		    http://www.isi.edu/~touch/
ISI / Project Leader, ATOMIC-2, LSAM       http://www.isi.edu/atomic2/
USC / Research Assistant Prof.                http://www.isi.edu/lsam/

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