[13671] in cryptography@c2.net mail archive
Re: Pre-cursor to Non-Secret Encryption
daemon@ATHENA.MIT.EDU (Dave Howe)
Wed Jun 18 10:35:59 2003
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
From: "Dave Howe" <DaveHowe@gmx.co.uk>
To: "Email List: Cryptography" <cryptography@metzdowd.com>
Date: Wed, 18 Jun 2003 15:24:19 +0100
John Young wrote:
> James Ellis, GCHQ, in his account of the development of non-secret
> encryption credits a Bell Laboratories 1944 report on "Project
> C-43" for stimulating his conception:
However the concept seems familiar enough - unless I am missing something, a
PRNG (n for noise rather than number this time) in sync with a similar PRNG
at the recipient end is mixed with the plaintext signal to give a
cryptotext; the matching unit subtracts the same values from the received
signal to give the original plaintext. If it were digital we would probably
xor it :)
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