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Chaocipher (Top 10 Uncracked Codes)

Chaocipher

Chaocipher

John F. Byrne invented Chaocipher in 1918 and tried unsuccessfully for almost 40 years to interest the U.S. government in his cipher system. He offered a reward to anyone who could break his cipher but the reward was never claimed. In 1989, John Byrne, son of John F. Byrne, demonstrated Chaocipher to two Cryptologia editors to determine if it had any commercial value. After making some improvements and providing additional information they jointly issue a new challenge to would-be solvers. In his autobiography, Silent Years, John F. Byrne, a lifelong friend of James Joyce, devoted the last chapter to Chaocipher which he had invented in 1918. Byrne described his attempts starting in 1920 to interest the State, War, and Navy Departments in his indecipherable cipher and his frustration with the disinterest shown by William F. Friedman and other cryptanalytic experts after he had demonstrated his machine.