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In the history of cryptography, 91-shiki injiki ("System 91 Printing Machine") or Ang ki Taipu-A ("Type A Cipher Machine"), codenamed Red by the United States, was a diplomatic cryptographic machine used by the Japanese Foreign Office before and during World War II. A relatively simple device, it was quickly broken by western cryptographers. The Red cipher was succeeded by the "Purple" machine ("97-shiki bun inji-ki") which used some of the same principles. Parallel usage of the two systems assisted in the breaking of the Purple system. The Red cypher should not be confused with the Red naval code, which was used by the Imperial Japanese Navy between the wars. The latter was a codebook system, not a cipher.