week 4 discussion information security

Pick one of the 22, MIT 6.858 Computer Systems Security, Fall 2014 [https://www.youtube.com/playlist?list=PLUl4u3cNGP62K2DjQLRxDNRi0z2IRWnNh] videos and create your own thread discussing at least three concepts presented in or that you learned from the video.  As a note, each student must chose a different video (you cannot use a previously discussed video) for this discussion board.