Chaocipher information

The Chaocipher^[1] is a cipher method invented by John Francis Byrne in 1918 and described in his 1953 autobiographical Silent Years.^[2] He believed Chaocipher was simple, yet unbreakable. Byrne stated that the machine he used to encipher his messages could be fitted into a cigar box. He offered cash rewards for anyone who could solve it.

Byrne tried unsuccessfully to interest the US Signal Corps and Navy in his system. Although numerous students of classical cryptanalysis attempted to solve the challenge messages over the years, none succeeded. For 90 years, the Chaocipher algorithm was a closely guarded secret known only to a handful of persons.

In May 2010 Byrne's daughter-in-law, Patricia Byrne, donated all Chaocipher-related papers and artifacts^[3] to the National Cryptologic Museum in Ft. Meade, Maryland, USA. This led to the disclosure of the Chaocipher algorithm.^[4]

^ What is Chaocipher?, The Chaocipher Clearing House, retrieved August 8, 2010
^ Byrne, J. F. 1953 . Silent Years: An Autobiography with Memoirs of James Joyce and Our Ireland . New York : Farrar, Straus, and Young (Reprinted in 1975 by Octagon Books, a division of Farrar, Straus, and Giroux).
^ Chaocipher Machine and Papers Archived 2010-07-22 at the Wayback Machine National Cryptologic Museum, retrieved July 2, 2010
^ Rubin, Moshe (July 2, 2010). "Chaocipher Revealed: The Algorithm" (PDF). Retrieved July 3, 2010.

[1] What is Chaocipher?, The Chaocipher Clearing House, retrieved August 8, 2010

[2] Byrne, J. F. 1953 . Silent Years: An Autobiography with Memoirs of James Joyce and Our Ireland . New York : Farrar, Straus, and Young (Reprinted in 1975 by Octagon Books, a division of Farrar, Straus, and Giroux).

[3] Chaocipher Machine and Papers Archived 2010-07-22 at the Wayback Machine National Cryptologic Museum, retrieved July 2, 2010

[Revealed-4] Rubin, Moshe (July 2, 2010). "Chaocipher Revealed: The Algorithm" (PDF). Retrieved July 3, 2010.

Chaocipher information

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