Article View: sci.crypt
Article #3366Re: bitwise exclusive-or
From: sewilco
Date: Thu, 29 Jan 1987 14:24
Date: Thu, 29 Jan 1987 14:24
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1522 bytes
In article <5580@brl-smoke.ARPA> gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>) writes:
>In article <434@ethz.UUCP> wyle@ethz.UUCP writes:
>>Messages are encoded via bit-wise exclusive-or, and transmitted via
>>non-secure telecommunications. The destinations use the courier-provided
>>random bits from the key tape to decode the messages. Each bit is
>
>Believe it or not, but sooner or later the encryptor will fail
>and generate encrypted text that is easily readable (perhaps
>entirely in clear!). It is not considered "cheating" for a
>cryptanalyst to use the resulting cheap decryption.
It is very easy for an exclusive-or to fail. Too many zeroes and plain
text is the result. Too many ones and it is inverted plain text.
--
Scot E. Wilcoxon Minn Ed Comp Corp {quest,dayton,meccts}!mecc!sewilco
(612)481-3507 sewilco@MECC.COM ihnp4!meccts!mecc!sewilco
"Who's that lurking over there? Is that Merv Griffin?"
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!rutgers!dayton!meccts!meccsd!mecc!sewilco From: sewilco@mecc.UUCP Newsgroups: sci.crypt Subject: Re: bitwise exclusive-or Message-ID: <875@mecc.MECC.COM> Date: Thu, 29-Jan-87 09:24:15 EST Article-I.D.: mecc.875 Posted: Thu Jan 29 09:24:15 1987 Date-Received: Sat, 31-Jan-87 06:06:27 EST References: <434@ethz.UUCP> <5580@brl-smoke.ARPA> Sender: news@mecc.MECC.COM Reply-To: sewilco@mecc.UUCP (Scot E. Wilcoxon) Organization: Minn Ed Comp Corp, St. Paul Lines: 18