April 15, 2026 Outline

Reading: text, §6.5, 7
Assignments: Project selection, due April 17; Homework #2, due April 24

1. Trust models

2. Availability
   1. Deadlock
   2. Denial of Service

3. Denial of service components

4. Constraint-based model
   1. User agreement

5. State-based model
   1. Resource allocation system model
   2. Denial of service protection base
   3. Waiting time policy

6. Availability and network flooding

7. Countermeasures
   1. Manipulate opening of connection
   2. Control which packets get through, or the rate at which they get through

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

ECS 235B, Foundations of Computer and Information Security Version of April 13, 2026 at 5:56PM

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