- M-325
In the
history of cryptography , M-325, also known as SIGFOY, was an Americanrotor machine designed byWilliam F. Friedman in1936 . Between1944 and1946 , more than 1,100 machines were deployed within theUnited States Foreign Service . Its use was discontinued in 1946 because of faults in operation. Friedman applied for a patent on the M-325 on11 August ,1944 ; it was granted on17 March ,1959 (US patent #2,877,565).Like the Enigma, the M-325 contains three intermediate rotors and a reflecting rotor.
ee also
*
Hebern rotor machine
*SIGABA References
* Louis Kruh, Converter M-325(T), "Cryptologia 1", 1977, pp143–149.
External links
* [http://www.ilord.com/m-325-manual.html Operating and Keying Instructions for Converter M-325(T) Headquarters] , Army Security Agency, July 1948, scanned and transcribed by Bob Lord.
* [http://www.jproc.ca/crypto/m325.html Friedman M-325] — information and photographs.
*
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