Cryptography

The Turing Award, organized by the Association for Computing Machinery, is often described as the Nobel Prize for computer specialists. Its early winners included two pioneers of artificial intelligence: Marvin Minsky (1969) and John McCarthy (1971). The most recent winners were Whitfield Diffie, former Chief Security Officer of Sun Microsystems and Martin Hellman, Professor Emeritus of Electrical Engineering at Stanford University. In 1976, they invented the fascinating subject of public-key cryptography, which enables users of the commercial World Wide Web to communicate in total safety. This subject is not easy to understand, but it concerns us in such an everyday fashion that it's worthwhile making an effort to see how it works. I therefore recommend that you study carefully the following excellent video:

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You might need to watch this video several times, while taking notes, in order to understand clearly the principles of public-key cryptography.