Wartime spies' code gets new life on CD

Tuesday, 30 July 2002, 11:44 AM EST

DeCipher's Ciphertxt uses the well-known "one-time pad" system to encrypt or scramble text files for document storage, or for sending documents in emails.

It was used as a manual system in World War II and relies on the sender and the receiver both having the same secret "keys" of random characters.Each character of the message is coded against a separate random character in the key.

Aucklanders Mike and Sue Spence have put a 5000-page key on to CDs which also contain the encryption software.

Each part of the key is used only once, and when 5000 pages are done, a new key CD must be obtained.

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