Foundations of Network and Computer Security J J ohn Black Lecture #22 Oct 21 st 2009 CSCI 6268/TLEN 5550, Fall 2009

Announcements Remember to read the virus paper Midterm is next time (Friday) Today we’ll do an overview, plus quiz solutions

What to Study Easiest way to study: –Review the slides (all online) –Review the two reading assignments –Review the quizzes More time-consuming way to study: –Review the lectures

Test Format/Content Just like the quizzes Almost anything from the lectures/reading is fair game but… –I won’t ask you to expand acronyms –I won’t ask you to produce OpenSSL commands

Content (cont) Questions will test understanding –Do you understand basic definitions Eg, what is a blockcipher, is computational indistinguishability, one-time pad, ACMA, etc How does a signature differ from a MAC? –Do you understand why algorithms work a certain way Eg, why does CBCMAC fail if message lengths vary? Why can’t K2=K3 in XCBC

Content (cont) Networking content –We did a review and the questions will correspondingly be less in-depth Eg, how does TCP differ from UDP When are fragmented packets reassembled –But, I won’t test you on things we didn’t review Eg, explain the TCP sliding window algorithm

We have 50 mins This is a 50 min exam, so it will be similar in length to the quizzes –I’d rather give a longer test, but this is a constraint with the MWF schedule Expect a slightly longer test with fewer “hard” problems –A “hard” problem is something like the question about 2-round DES

Quiz Review