Ekstra lecture on DES/AES next week

Lecture 2 is now online. Unfortunately, I ran a little short on time, meaning that I had to skip or rush most of the details concerning implementations of concrete block ciphers, such as DES and AES. Since I don't feel that this gives the topic its deserved justice, I will record an extra segment next week during the recitation hour (provided time permits and there are not too many questions) to also cover DES and AES properly. In the meantime, and in particular for this week's problem set, you will have to consult (e.g. [BR]) for more info on DES and AES.