Article View: sci.crypt
Article #1271Re: A new encryption problem?
From: Carl Ellison
Date: Fri, 06 Nov 1992 19:46
Date: Fri, 06 Nov 1992 19:46
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1426 bytes
In article <lfjmkiINNa74@exodus.Eng.Sun.COM> silber@orfeo.Eng.Sun.COM (Eric Silber) writes:
> Require: (for-all p)( (c=E(p)) is a text which appears to be
> a plaintext)
The problem here is that both c and p must carry information and be
believable both in style and as a real communication. ("The pen of my aunt
is on the table" doesn't pass as a real communication even though it parses
correctly.) So, the encrypted text must be hidden in the free choices of
the cover communication. Since that cover communication needs to be
uniform in style, so as to fool the censors, you have very few choices.
This means that the bit rate is rather low...or, in other words, the
ciphertext will be much larger than the plaintext.
--
-- <<Disclaimer: All opinions expressed are my own, of course.>>
-- Carl Ellison cme@sw.stratus.com
-- Stratus Computer Inc. M3-2-BKW TEL: (508)460-2783
-- 55 Fairbanks Boulevard ; Marlborough MA 01752-1298 FAX: (508)624-7488
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Path: arc1-ca.pugleaf.net!sparky!uunet!ulowell!m2c!bu.edu!transfer!ellisun.sw.stratus.com!cme From: cme@ellisun.sw.stratus.com (Carl Ellison) Newsgroups: sci.crypt Subject: Re: A new encryption problem? Message-ID: <7986@transfer.stratus.com> Date: 6 Nov 92 19:46:42 GMT References: <lfjmkiINNa74@exodus.Eng.Sun.COM> Sender: usenet@transfer.stratus.com Organization: Stratus Computer, Software Engineering Lines: 18