M-325
American cryptography machine
From Wikipedia, the free encyclopedia
In the history of cryptography, M-325, also known as SIGFOY,[2] was an American rotor machine designed by William F. Friedman and built in 1944.[3] Between 1944 and 1946, more than 1,100 machines were deployed within the United States Foreign Service. Its use was discontinued in 1946 because of faults in operation. Friedman applied for a patent on the M-325 on 11 August 1944;[4] it was and was granted on 17 March 1959 (US patent #2,877,565).
Date invented1944[1]
Typerotor machine
Like the Enigma, the M-325 contains three intermediate rotors and a reflecting rotor.
