week 4 discussion information security

Pick one of the 22MIT 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.