Extra Credit 2

Due: October 23, 2024
Points: 30

  1. (30 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
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ECS 235A, Computer and Information Security
Version of October 8, 2024 at 7:09PM

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