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Article #3371

Re: bitwise exclusive-or

#3371
From: falk
Date: Fri, 30 Jan 1987 17:33
19 lines
1679 bytes
In article <875@mecc.MECC.COM> sewilco@mecc.UUCP (Scot E. Wilcoxon) writes:
>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.

So what?  All you get is small fragments of recognizable text.  For all
the spy who sees it knows, it could have been something else that got
changed *into* something readable.  If your random number is any good
at all, very long strings of zeros and ones won't appear.  For instance,
for twenty characters in a row to come out unencrypted (assuming you're
using 7-bit ascii) would require 140 zeros in a row to come out of the
random number generator.  This happens once every
199,113,796,415,000,000,000,000,000,000,000,000,000,000 characters of
output.  Note that the phrase "Nuke Moskow tomorrow", complete with
correct spelling and capitalization occurs in encrypted text
(regardless of what the original text said) with *exactly* the same
frequency as a 20-character burst of unencrypted text.

	-ed falk, sun microsystems
(don't need no nsa lineater for this one)
Technical Details
Message-ID: <12419@sun.uucp>
Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!rutgers!sri-spam!ames!oliveb!sun!peregrine!falk
References: <434@ethz.UUCP> <5580@brl-smoke.ARPA> <875@mecc.MECC.COM>

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Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!rutgers!sri-spam!ames!oliveb!sun!peregrine!falk
From: falk@peregrine.UUCP
Newsgroups: sci.crypt
Subject: Re: bitwise exclusive-or
Message-ID: <12419@sun.uucp>
Date: Fri, 30-Jan-87 12:33:32 EST
Article-I.D.: sun.12419
Posted: Fri Jan 30 12:33:32 1987
Date-Received: Sat, 31-Jan-87 08:20:45 EST
References: <434@ethz.UUCP> <5580@brl-smoke.ARPA> <875@mecc.MECC.COM>
Sender: news@sun.uucp
Reply-To: falk@sun.UUCP (Ed Falk)
Organization: Sun Microsystems, Mountain View
Lines: 19