Post for lecture on 2 October

1. The most important topics have been the ones to do with number theory, such as finding inverses mod n and finite fields since they have a big role in the cryptosystems.
2. I would expect to see a fair amount of computational questions with number theory and some theoretical questions testing the ideas of how certain cryptosystems work and how they can be attacked.
3. I should put in some more time working with the finite fields and ECB and other methods for implementing block ciphers.