Bombe decryption machine

Bombe decryption machine

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Credit: JAMES KING-HOLMES/BLETCHLEY PARK TRUST/SCIENCE PHOTO LIBRARY

Caption: Bombe decryption machine. Hand adjusting dials on a replica Bombe. Designed by mathematician Alan Turing, this device was used during World War 2 to decrypt German communications enciphered with the Enigma machine. The bombe was used to work out the Enigma settings in use each day, allowing messages to be deciphered. It required a short stretch of encrypted message with a known meaning (a "crib"). It was named after the Bomba, a machine used by Polish cryptographers to break simple variants of Enigma before the war. Photographed at Bletchley Park, England, the original site of the Allied codebreaking effort.

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Keywords: bletchley park, bombe, breaking, cipher, code, codebreaking, computing history, cracking, cryptography, cryptology, decoding, decryption, device, dial, dials, electromechanical, enigma, hand, historical, machine, operator, rotor, rotors, setting, technology

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