At Bletchley Park in the 1940s, Alan Turing and colleagues decrypted Enigma messages, providing ULTRA intelligence that aided Allied victory. The United States began launching military communications satellites in the 1960s, and by 1982 the second- and third-generation DSCS satellites offered nuclear-hardened, anti-jamming, high-data-rate links worldwide. In 1976, Diffie–Hellman introduced public-key cryptography, and DES was…
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