Summary for Week 3

Lecture 5: We covered 2DES and 3DES. We also strated modes of operation, such
as ECB, CBC, and CTR mode.
Date: Tu, 01/31/2006.

Lecture 6: We finished mode of operations: CTR and CFB. We also started mathematics
that we need for publickey cryptography. We covered arithmetic mode n and algorithm
for computing GCDs.
Date: Th, 02/02/2006.
Reading assignment: Read the output feedback mode (mode). Get familiar with the
GCD algorithm.