[14054] in cryptography@c2.net mail archive
Re: cryptographic ergodic sequence generators?
daemon@ATHENA.MIT.EDU (Adam Back)
Sun Sep 7 00:05:02 2003
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Sat, 6 Sep 2003 18:11:20 -0700
From: Adam Back <adam@cypherspace.org>
To: "Perry E. Metzger" <perry@piermont.com>
Cc: Greg Rose <ggr@qualcomm.com>, cryptography@metzdowd.com
In-Reply-To: <87d6edwm4h.fsf@snark.piermont.com>
You might also look at RC5-16. RC5 is defined on 64, 32, 16 and 8 bit
words with respectively 128, 64, 32 and 16 bit block sizes.
Using counter-mode as suggested by someone earlier in the thread would
be the obvious way to get a sequence with a period of 2^n.
The Yarrow RNG uses counter-mode as a PRNG. However in the paper they
describe some effects you may want to avoid by re-keying depending on
your application as the stream becomes distinguishable from random
output.
Adam
On Sat, Sep 06, 2003 at 07:08:46PM -0400, Perry E. Metzger wrote:
> Greg Rose <ggr@qualcomm.com> writes:
> I was unaware there *were* any good 32 bit block ciphers out there,
> thus the question. Certainly that would do better than most
> possibilities for this, yes.
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