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CODE is an all-purpose encoder/decoder for any file. Unlike
most encoders, CODE can even encode and decode .EXE and .REL files and
decode them back to executable form. CODE preserves line numbers on
EDIT (SOS) files, which are still recognizable by EDIT after decoding.
To sum up: CODE encodes and decodes files back to their original
state, letter by letter. It will work on RUNOFF output, complete with
bolding and underlining intact.
CODE's method of encoding is simple: When encoding, CODE asks
for a password code. This can be any string of characters including
spaces. Remember this password; you will need to tell CODE it for
decoding. CODE takes the ASCII value of the password, and the text,
and adds them together. It takes the file letter by letter and rotates
the password. (When decoding, CODE subtracts letters). When
outputting, CODE represents control codes as ^char, so the file cannot
be edited, or if it is, it cannot be destroyed. CODE never prints
carriage returns, so its output can't usually go into EDIT. Note that
line numbers in a file are unwise since it may be possible to guess
the password from them.
CODE is not entirely secure; but it will take at least a few
days to break the password. For general security, CODE is safe.
CODE was written by Joshua Brodsky and Lawrence Hinden at the
University of D. C. This version was last updated 7/7/82.
The /RUN switch, typed after a DECODE command, will cause CODE
to push a command level, execute the program after it has been
encoded, and delete and expunge the decoded source and .REL files.
CODE accepts the following commands:
CODE>Encode (file) FILESPEC (to) FILESPEC [TTY:] [/Echo]
This encodes the specified file. Default output file is TTY:.
/Echo will cause the password to echo on your terminal.
CODE>Decode (file) FILESPEC (to) FILESPEC [TTY:] [/Echo, /Run, /Both]
This decodes a previously encoded file. Default output is
TTY:. /Echo will echo the password, /Run will execute the program, and
/Both will do both.
CODE>Help (with CODE program)
This causes this message to print.
CODE>Stop (CODE and go to EXEC)
This exits from CODE. CONTINUE is allowed.