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

  / computerphile  
  / computer_phile  

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