Computer Security and Cryptography

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19.6 THE ROLE OF PATENTS IN CRYPTOGRAPHY

Cryptologia published United States Cryptographic Patents: 1861–1981, by Jack Levine, which lists several hundred U.S. patents relating to cryptography spanning two decades:

#31,902 – Alfred E. Parks – April 2, 1861 ♠ “Telegraph Register”.
#4,308,556 – Hiroshi Osaka – December 29, 1981 ♠ “Television Video Signal Scrambling System”.

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