Path: utzoo!mnetor!uunet!husc6!mit-eddie!bbn!rochester!PT.CS.CMU.EDU!andrew.cmu.edu!jk3k+
From: jk3k+@andrew.cmu.edu (Joseph G. Keane)
Newsgroups: sci.crypt
Subject: Re: One time pads?
Message-ID: <cW8SR0y00XoCREk38I@andrew.cmu.edu>
Date: 23 Feb 88 20:40:32 GMT
References: <4209@june.cs.washington.edu> <1988Feb15.151522.5094@utzoo.uucp> <7272@brl-smoke.ARPA> <4104@hoptoad.uucp> <7315@brl-smoke.ARPA>,
	<858@astroatc.UUCP>
Organization: Carnegie Mellon University
Lines: 10
In-Reply-To: <858@astroatc.UUCP>



> How about using the message itself, in some form or another,
> as the pad.
> comments?

Not very secure: all you have to do is guess the first character!  Even if you 
have a reasonably large key (offset), a known-plaintext attack will get some 
information, and it propagates forward and backward.

--Joe