Extra Credit #3

Due: May 7, 2021
Points: 30

Questions

  1. (15 points) Prove Theorem 6.1 for the strict integrity policy of Biba’s model.

  2. (15 points) The index of coincidence was defined as “the probability that two randomly chosen letters from the ciphertext will be the same.” Derive the formula in Section 10.2.2.1 for the index of coincidence from this definition.

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Matt Bishop
Office: 2209 Watershed Sciences
Phone: +1 (530) 752-8060
Email: [email protected]
ECS 153, Computer Security
Version of April 23, 2021 at 12:53AM

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