Tomorrow, in what seems to be becoming an annual tradition, I’ll be giving a talk on cryptography at the Geometry Club. Since it’ll be a talk-and-chalk style seminar, I don’t have any slides to make available, but many of the topics I’ll be discussing have appeared earlier on this blog or everything2. In particular, I’m planning to include:

• A brief overview of public-key cryptography: my notes from last year’s talk cover technical details in the context of (EC)DLP, or there’s this friendlier article on Diffie-Hellman key exchange and man-in-the-middle attacks.
• The problems of Authentication and Mutual Authentication at a protocol level, and the undecidability of the secrecy problem via Post’s Correspondence Problem.
• Lattice-based cryptography- which hopefully I can summarise in a later post.