The Japanese M-1 cipher machine was a mechanical device the Japanese used for performing cryptography sometime during the 1930s. More specifically it was used by naval attaches. The US called it the ''ORANGE machine''.
Cryptographically it is similar to the
Red cipher; it was broken by
Agnes Driscoll
Agnes Meyer Driscoll (July 24, 1889 – September 16, 1971), known as "Miss Aggie" or "Madame X'", was an American
cryptanalyst during both World War I and World War II and was known as “the first lady of naval cryptology."
Early years
Born in ...
(Madame X).
References
Encryption devices
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