

John Nash Letters
At the height of his career in mathematics, Dr. John Nash wrote a series of letters to the National Security Agency proposing ideas for an encryption-decryption machine. The ideas were acknowledged, but never adopted by the Agency. The letters were preserved with the Agency's analysis of his ideas in a collection of unsolicited correspondence received by the Agency in 1955.
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John Nash Letters
John Nash Letters
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National Cryptologic Museum
John Nash Letters
Exhibit contents
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Cryptologic Treasures
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Yardley
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Meet the Friedmans
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Hebern
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Danish Cipher Disk
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Tunny | Sturgeon | Colossus
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Enigma
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U.S. Navy Bombe
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RED
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The Magic of PURPLE
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Battle of Midway
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Korean War
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START Verification
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John Nash Letters
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Created:January 12, 2021Last updated:January 12, 2021
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