1. The subsection 7.5.1 talking about the security of ElGamal ciphertexts was hard to follow. I understand what each of the propositions is saying, but I don't quite understand either of the proofs. Also, in section 7.3, I had a hard time connecting the football analogy to the math behind it.
2. I liked this section because I understood it; this is something that is becoming more and more rare. It was interesting to learn a method by which Alice and Bob can both know a key without being in the same room. Also, the ElGamal system was interesting. I was wondering if it is computationally more difficult to solve discrete logarithms or to factor large primes.
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