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Path: utzoo!henry
From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.crypt
Subject: Re: randomly adding bits/bytes
Message-ID: <7024@utzoo.UUCP>
Date: Wed, 6-Aug-86 13:21:51 EDT
Article-I.D.: utzoo.7024
Posted: Wed Aug  6 13:21:51 1986
Date-Received: Wed, 6-Aug-86 13:21:51 EDT
References: <8608042018.AA04376@ucbjade.Berkeley.Edu>
Organization: U of Toronto Zoology
Lines: 13

> ... Using compress(1) before using crypt(1) or
> a DES-based system is an excellent idea, as long as the person at the
> other ends knows to uncompress(1) the message afterwards.

Um, actually, there may be a serious problem here:  compress(1)ed files
start with stereotyped header information that could offer a cryptanalyst
the opportunity for a known-plaintext attack.  Something needs to be done
about that before generally recommending this approach (which is a good
one otherwise).
-- 
EDEC:  Stupidly non-standard
brain-damaged incompatible	Henry Spencer @ U of Toronto Zoology
proprietary protocol used.	{allegra,ihnp4,decvax,pyramid}!utzoo!henry