[42499] in Cypherpunks
Re: EE Times on IDEA
daemon@ATHENA.MIT.EDU (John A. Thomas)
Sun Oct 29 22:28:42 1995
Date: Sun, 29 Oct 1995 19:20:33 -0800 (PST)
From: "John A. Thomas" <jathomas@netcom.com>
To: cypherpunks@toad.com
Cc: Eric Young <eay@mincom.oz.au>
In-Reply-To: <Pine.SOL.3.91.951030075604.12602E-100000@orb>
On Mon, 30 Oct 1995, Eric Young wrote:
> On Sat, 28 Oct 1995, Anonymous wrote:
> > Electronic Engineering Times
> > Oct 23, 1995 p. 66
> >
> > T.R MADHUSUDAN SASTRY,
> > T. GANESAN, B.MADHUKAR
> > AND N. SRINIVASA
>
> > involved. The current implementation of Idea in ECB on Motorola's DSP
> > 56166 running at 60 Mhz supports up to 625 kbits/second in full-duplex
> > mode. That is 3.6 > times faster than using the DES algorithm.
>
> That last statement is rubbish. For most CPU's I've seen, IDEA is either
> the same speed as DES or a bit slower. There is no way that it is 3
> times faster that single DES.
My implementation of IDEA on the TI TMS320C26 DSP runs at 99 kbytes/sec.
I havent't tried DES, but comparing DES code on the 80x86 to the 'C26
instruction set, I think the speeds would probably be about the same.
Whatever, these speeds leave plenty of time for simple speech coding in a
voice encryption system.
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