DOCUMENTATION FOR PGE20
              "PRETTY GOOD ENVELOPE Version 2.0"
                       Robert G. Durnal
    PRETTY GOOD ENVELOPE is a program suite for hiding a (binary) message 
in a larger binary file, and retrieving such a hidden message. The algorithm
is simple; append the message to the binary envelope file, and then append
a 4-byte pointer to the start of the message. To retrieve the message, the 
last 4 bytes of the file are read, the file pointer is set to that value,
and the file read from that point, excluding the last 4 pointer bytes.
	PGE20 is implemented so that it physically alters the envelope file as
found on disk, rather than reading it and re=writing it. So if you want to
preserve the envelope file unaltered, it is suggested that you work from a
copy of the original graphic or wave file. Full DOS file specification is
supported, up to a maximum of 36 characters. When retrieving a message, you
have complete control over the naming of the output file.
	Any character in the command tail will cause this file to be output to 
the screen, provided it is either in the current directory or a directory
in the DOS path specification. No options or file specs are supported in the 
command line except for this .DOC file.
	PGE version 1.0 was written by an author using the alias Roche'Crypt, 
and contained a simple encryption system which, because of the passphrase 
length, was probably subject to ITAR. This version contains no such system, 
depending on standard encryption programs to take care of that, so ITAR does 
not apply to this program.
$