Coder-Decoder © 1981 Edge Soft.
A 'utility' program that is used for a specific purpose. The program will automatically encrypt a message using some special rules. Only another Arcade with the same program will be able to decrypt the message. Note that this is not a substitution type of code, but real encryption, where a single letter does not always have the same meaning.
Published in ARCADIAN 6, no. 1 (November 10, 1981): 6,8.