Outline for October 11, 2021

Reading: text, §10.4–10.5, 11.1, 11.2
Due: Homework 2, due October 20

  1. Cryptographic Checksums
    1. Function y = h(x): easy to compute y given x; computationally infeasible to compute x given y
    2. Variant: given x and y, computationally infeasible to find a second x′ such that y = h(x′)
    3. Keyed vs. keyless

  2. Digital Signatures
    1. Judge can confirm, to the limits of technology, that claimed signer did sign message
    2. RSA digital signatures: sign, then encipher, then sign

  3. Session and interchange keys

  4. Key Exchange

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 11, 2021 at 10:48PM

You can also obtain a PDF version of this.

Valid HTML 4.01 Transitional Built with BBEdit Built on a Macintosh