Lecture 16: May 3, 2021

Reading: text, §8.3–8.4,10.1–10.2.2
Due: Lab 2, due May 5, 2021; Homework 3, due May 10, 2021 (Note new due date)

1. Originator-controlled access control
   1. Digital rights management

2. Role-based access control

3. Cryptography
   1. Codes vs. ciphers
   2. Attacks: ciphertext only, known plaintext, chosen plaintext
   3. Types: substitution, transposition

4. Symmetric Cryptography
   1. Monoalphabetic (simple substitution): f(a) = a + k mod n
   2. Example: Caesar (shift) cipher with k = 3, RENAISSANCE → UHQDLVVDQFH

Matt Bishop Office: 2209 Watershed Sciences Phone: +1 (530) 752-8060 Email: [email protected]

ECS 135, Computer Security Version of May 3, 2021 at 11:17PM

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