Assertion: key cryptography | /r/HasProperty | discovered by james ellis
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Source sentences:
text: However, Admiral Bobby Inman, while director of the U.S. National Security Agency (NSA) from 1977 to 1981, revealed that two-key cryptography had been known to the agency almost a decade earlier, having been discovered by James Ellis, Clifford Cocks, and Malcolm Williamson at the British Government Code Headquarters (GCHQ).