From: Karl Lui Barrus <klbarrus@owlnet.rice.edu>
Date: Fri, 1 Oct 93 15:53:40 PDT
To: cypherpunks@toad.com
Subject: FIDO, encryption
Message-ID: <9310012250.AA19691@arcadien.owlnet.rice.edu>
MIME-Version: 1.0
Content-Type: text/plain


-----BEGIN PGP SIGNED MESSAGE-----

Here is the companion script to the other one I posted. It takes the
output of the previous script (which takes PGP encrypted ascii to a
list of geopraphic name), and turns it back into a PGP file.

Not really stegonography since it's really just a substitution cipher.
But, with a more sophisticated output grammar, you could embed your
encrypted file in a bizarre vacation itinerary :-)

pgphide < file.asc | mail -s "not encryped at all" user@host

and then

pgpuhide < mail_file_from_sneaky_person > pgpfile.asc

will allow your friend decrypt pgpfile.asc.

- ----------
#!/usr/local/bin/perl

#pgpunhide - converts a geographic file back to pgp
#Karl L. Barrus <klbarrus@owlnet.rice.edu>

%conversion = (
  'canada', '0', 'united states', '1', 'mexico', '2', 
  'pacific ocean', '3', 'atlantic ocean', '4', 'arctic ocean', '5', 
  'gulf of mexico', '6', 'north america',  '7', 'allegheny mountains', '8', 
  'rocky mountains', '9', 'alabama',  'a', 'alaska', 'b', 
  'arizona', 'c', 'new mexico', 'd', 'arkansas', 'e', 
  'california', 'f', 'colorado', 'g', 'connecticut', 'h', 
  'rhode island','i', 'delaware', 'j', 'maryland', 'k', 
  'florida','l', 'georgia', 'm', 'hawaii', 'n', 
  'idaho','o', 'illinois', 'p', 'indiana', 'q', 
  'iowa','r', 'kansas', 's', 'kentucky', 't', 
  'louisiana','u', 'maine', 'v', 'massachusetts', 'w', 
  'michigan','x', 'minnesota', 'y', 'mississippi', 'z', 
  'missouri','A', 'montana', 'B', 'nebraska', 'C', 
  'nevada','D', 'utah', 'E', 'new hampshire', 'F', 
  'vermont','G', 'new jersey', 'H', 'new york', 'I', 
  'north carolina','J', 'north dakota', 'K', 'south dakota', 'L', 
  'ohio','M', 'oklahoma', 'N', 'oregon', 'O', 
  'pennsylvania', 'P', 'south carolina', 'Q', 'tennessee', 'R', 
  'texas','S', 'virginia', 'T', 'washington', 'U', 
  'west virginia','V', 'wisconsin', 'W', 'wyoming', 'X', 
  'washington d.c.','Y', 'bermuda', 'Z', 'guam', '+', 
  'puerto rico','/', 'virgin islands','=', 
);

print "-----BEGIN PGP MESSAGE-----\n";
print "Version: 2.3a\n\n";

while (<>) {
  $line = $_;
  chop $line;

  if ($line eq "") {
    print "\n";
  }
  else {
    print $conversion{$line};
  }
}

print "-----END PGP MESSAGE-----\n";

-----BEGIN PGP SIGNATURE-----
Version: 2.3a

iQCVAgUBLKyz4YOA7OpLWtYzAQF3JAP9EjWnj7pix65fJLFf9mE+gLkw719nX0Xa
jMgHFxmDIdeOxewi9ZnuzE99QqQHv4+TO3dO+CGg0zxGhCMO8/mu4vQtK6825kHl
9fESP/f2oSVLDPd2/Zv3c0/kMKe9UnMModNgl7tngzsMeBkFJVCnKjkQNGsJGCSz
C5Z4uXaZccs=
=M+N2
-----END PGP SIGNATURE-----