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📸 1/3: M-209 cipher machine c. 1940s Designed by Boris Hagelin (1892–1983) Smith & Corona Typewriters, Inc. Syracuse, New York Courtesy of the National Cryptologic Museum (@NatCryptoMuseum) L2021.0910.001 This tweet was posted on March 28, 2022.
📸 2/3: Female cryptologists working at Arlington Hall; Ann Caracristi (1921–2016), pictured front-right, later became deputy director of the National Security Agency (NSA) c. 1944 Arlington, Virginia Courtesy of the National Cryptologic Museum (@NatCryptoMuseum) R2021.0910.002 This tweet was posted on March 28, 2022.
📸 3/3: A woman operates a foolproof American SIGABA cipher machine, decrypting messages, and intercepting and forwarding enemy coded messages c. 1944 Courtesy of the National Cryptologic Museum (@NatCryptoMuseum) R2021.0910.003 This tweet was posted on March 28, 2022.