[4371] in cryptography@c2.net mail archive
Re: Stego for watermarking Perl5 code?
daemon@ATHENA.MIT.EDU (Dan Geer)
Tue Mar 23 10:27:35 1999
To: "Shabbir J. Safdar" <shabbir@mindshare.net>
Cc: cryptography@c2.net
In-Reply-To: Your message of "Mon, 22 Mar 1999 14:18:43 EST."
<v04003a11b31c3738bcad@[209.219.73.39]>
Date: Mon, 22 Mar 1999 21:49:50 -0500
From: Dan Geer <geer@world.std.com>
Shabbir,
In the 70's and early 80's, I was part of a team distributing
a modestly massive Fortran program that we wanted people to
use but not commercialize. Our solution then, well before we
all got so smart, was to convert every label, variable, subroutine
name, etc., to a random sequence of M, W and N, all six characters
long (3^^6=729) and that seemed to derail the modifiers. We did,
for what it is worth, hide a customer identifier in there somewhere.
Low tech, but it seemed to work.
--dan
