Outline for October 14, 2022

Reading: text, §13.5–13.8, 15.1–15.5
Due: Homework 2, due October 21; Progress report, due Nov 4

  1. Defenses
    1. For trial and error at login: dropping or back-off
    2. For thwarting dictionary attacks: salting

  2. One-Time Password
    1. Password is valid for only one use
    2. May work from list, or new password may be generated from old by a function or a hardware token

  3. Challenge-response systems
    1. Computer issues challenge, user presents response to verify secret information known/item possessed
    2. Example operations: f(x) = x+1, random, string (for users without computers), time of day, computer sends E(x), you answer E(D(E(x))+1)
    3. Note: password never sent over network

  4. Biometrics
    1. Depend on physical characteristics
    2. Examples: pattern of typing (remarkably effective), retinal scans, etc.

  5. Location
    1. Bind user to some location detection device (human, GPS)
    2. Authenticate by location of the device

  6. Multi-factor authentication

  7. Identity
    1. Files, objects
    2. Useers, groups, roles

  8. Certificates

UC Davis sigil
Matt Bishop
Office: 2209 Watershed Sciences
Phone: +1 (530) 752-8060
Email: mabishop@ucdavis.edu
ECS 235A, Computer and Information Security
Version of October 13, 2022 at 10:14PM

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