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product cipher: Media

cryptology

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ADFGVX cipher
The ADFGVX cipher, employed by the German army in World War I.
Encyclopædia Britannica, Inc.
DES flow diagram

Flow diagram for the 16-step Data Encryption Standard (DES) operation.

From Data Encryption Standard, FIPS Publ. no. 46, National Bureau of Standards, 1977