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Article #571

Re: Try-out

#571
From: Paul Carl Kocher
Date: Fri, 10 Apr 1992 03:00
24 lines
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In article <1992Apr9.204018.12320@mnemosyne.cs.du.edu> bfairlan@isis.cs.du.edu (Brian Fairlane) writes:
>Interested people/companies: Send me textfiles, and I will encrypt
>                             them and send them back (uu-encoded).
>                             Of course I will use the same key for all
>                             your files, so you have One chance of making
>                             it (don't ask me how though).

You've just (re)invented security through obscurity.  The goal is to find
algorithms that are secure, even if the algorithm is publicly known, and
the "enemy" has access to other data encrypted with the same key (in both
encrypted & non-encrypted form), etc.  If knowing the algorithm makes it
possible to defeat the encryption, your system is of little practical use,
since anyone with a reverse-assembler and patience can figure out how the
encryption is done.

If you post your complete algorithm, I'm sure you'll get plenty of
feedback/suggestions.

-- Paul Kocher

________kocherp@leland.stanford.edu_________kocherp@jacobs.cs.orst.edu________
I am an undergrad at Stanford seeking summer work or contract jobs programming
(IBM PC), doing technical writing, or assisting with research. Send e-mail for
resume if interested!  - Paul Kocher/Box 13554/Stanford CA 94309, 415/497-6438
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Message-ID: <1992Apr10.030047.22070@leland.Stanford.EDU>
Path: arc1-ca.pugleaf.net!sparky!uunet!stanford.edu!leland.Stanford.EDU!kocherp
References: <1992Apr9.204018.12320@mnemosyne.cs.du.edu>

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Newsgroups: sci.crypt
Path: arc1-ca.pugleaf.net!sparky!uunet!stanford.edu!leland.Stanford.EDU!kocherp
From: kocherp@leland.Stanford.EDU (Paul Carl Kocher)
Subject: Re: Try-out
Message-ID: <1992Apr10.030047.22070@leland.Stanford.EDU>
Sender: news@leland.Stanford.EDU (Mr News)
Organization: DSG, Stanford University, CA 94305, USA
References: <1992Apr9.204018.12320@mnemosyne.cs.du.edu>
Date: Fri, 10 Apr 92 03:00:47 GMT
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