Wartime spies' code gets new life on CD
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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