For each lecture, we'll post slides, an outline of the content, a recording, and supplemental reading. Slides will be up before lecture (but not necessarily at 9:00am); we post slides with all animations (good for following along exactly) and with limited animations (good for studying/taking notes on). The outline and recording will be posted after lecture (but not necessarily at 3:00pm; likely the next day or so). You can do the supplemental reading before or after lecture; whatever works best for you.

• Slides: all animations, limited animations
• Outline
• Recording
• No supplemental reading for this lecture

After this lecture, at a minimum, you should be able to do the following:

• Understand public-key cryptography as a building block for (more) secure systems, in the same way you understand symmetric-key cryptography, hash functions, and MACs.
  • Note that using public-key cryptography for encryption is slightly different than using it for signatures.
• Describe how A constructs packets for use in onion routing as described in class (what data does A encrypt, and with what key).
• Given various configurations of proxies, along with various attempts at encryption, decide what sorts of adversaries (if any) would be able to infer that A was communicating with S.
• Explain how to use a single proxy to create a secure connection on a local network, if not all the way from A to S.

Practice problems

• 2018, Problem 16 (Solutions)
• 2016, Problem 20 (Solutions)