From: "Mark Grant, M.A. (Oxon)" <mark@unicorn.com>
Date: Fri, 5 Jan 1996 02:53:00 +0800
To: cypherpunks@toad.com
Subject: Re: 2047 bit keys in PGP
Message-ID: <Pine.3.89.9601041723.A21008-0100000@unicorn.com>
MIME-Version: 1.0
Content-Type: text/plain


On 4 Jan 1996, Ian Goldberg wrote:

> in a brute-force search.  From Applied Crypto, 2nd ed, pp157-158,
> setting or clearing one bit takes at _least_ 4.4*10^-16 erg of energy.

I thought reversible computing could use an arbitarily small amount of 
energy in computations ? Or is it that you can use it to get down to this 
level of energy loss, but not below ? I'm not sure.

	Mark