M-325

M-325
The M-325 (SIGFOY) cipher machine was inspired by the German Enigma
Date invented	1944^[1]
Type	rotor machine

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).

Like the Enigma, the M-325 contains three intermediate rotors and a reflecting rotor.

Friedman patented the design of the M-325 in US patent #2,877,565.

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References

^ F.L. Bauer (9 March 2013). Decrypted Secrets: Methods and Maxims of Cryptology. Springer Science & Business Media. pp. 133–. ISBN 978-3-662-03452-1.
^ Friedrich Ludwig Bauer (2002). Decrypted Secrets: Methods and Maxims of Cryptology. Springer Science & Business Media. pp. 137–. ISBN 978-3-540-42674-5.
^ Karl Maria Michael de Leeuw; Jan Bergstra (28 August 2007). The History of Information Security: A Comprehensive Handbook. Elsevier. pp. 407–. ISBN 978-0-08-055058-9.
^ Friedrich L. Bauer (24 November 2006). Decrypted Secrets: Methods and Maxims of Cryptology. Springer Science & Business Media. pp. 151–. ISBN 978-3-540-48121-8.

External links

Operating and Keying Instructions for Converter M-325(T) Headquarters, Army Security Agency, July 1948, scanned and transcribed by Bob Lord.
Friedman M-325 — information and photographs.
U.S. patent 2,877,565

v t e Cipher machines
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Secure voice	BID 150 FASCINATOR KY-3 KY-58 KY-68 NESTOR OMNI SCIP Sectéra Secure Module SIGSALY STE STU-II STU-III VINSON
Other	JADE KG-84 KL-43 KL-51 Noreen Red Purple Pinwheel Rockex
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v t e Cryptography
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Mathematics	Cryptographic hash function Block cipher Stream cipher Symmetric-key algorithm Authenticated encryption Public-key cryptography Quantum key distribution Quantum cryptography Post-quantum cryptography Message authentication code Random numbers Steganography
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This page was last edited on 10 January 2022, at 05:32

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