Lecture 13: April 27, 2026

Reading: text, §11.2–11.4, 12.1, 12.4, 12.5.3
Assignments: Homework 2, due April 28, 2026 (

1. Greetings and felicitations!

2. Key Exchange
   1. Needham-Schroeder and Kerberos
   2. Public key; man-in-the-middle attacks
   3. The discrete log problem and Diffie-Hellman

3. Key Generation
   1. Cryptographically random numbers
   2. Cryptographically pseudorandom numbers
   3. Strong mixing function

4. Cryptographic Key Infrastructure
   1. Certificates
   2. Merkle trees
   3. Certificate chains
   4. Certificate, key revocation

5. Attacks
   1. Precomputation
   2. Misordered blocks
   3. Statistical regularities
   4. Type flaw

6. Networks and cryptography
   1. Link vs.end-to-end encryption

7. TLS security

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: mabishop@ucdavis.edu

ECS 153A, Computer & Information Security & Privacy I Version of April 26, 2026 at 11:37PM

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