From Computerphile.

There’s a reason Needham–Schroeder isn’t used any more – Tim Muller demonstrates the weakness in the technique.

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This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham: https://bit.ly/nottscomputer

Computerphile is a sister project to Brady Haran’s Numberphile. More at http://www.bradyharan.com