Part 1. -Speech Privacy Systems- Interception, Diagnosis, Decoding, Evaluation. An Old Mystery Solved: Project C-43 and Public Key Encryption

For most of history, it was believed that the only way a message could be encrypted was if the sender and the receiver shared the secret of srambling and unscrambling the text. That view changed sharply in 1976, when Stanford computer scientists Martin E. Hellman and Whitfield Diffie published a paper called ““New Directions in Cryptography” that described what is now known as public key encryption (PKE). Two years later, Ron Rivest, Adi Shamir, and Len Adelman of MIT described a simpler method. When the web came along, the Diffie-Hellman and RSA algorithms became the bedrock of secure communications.
But PKE had an unknown pre-history.

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