Engineering, 21.02.2020 04:20 babycakez3500

Use de nition 2 of perfect secrecy (Lemma 2.4 of the textbook) to prove that the Vigenere cipher is not perfectly secret. Pr[EncK(m) = c] = Pr[EncK(m0) = c] (2.1) Lemma 2.4. An encryption scheme (Gen; Enc; Dec) with message space M is per- fectly secret if and only if Equation (2.1) holds for every m;m0 2 M and every c Є C.

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Use de nition 2 of perfect secrecy (Lemma 2.4 of the textbook) to prove that the Vigenere cipher is...

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