Markov Ciphers and Differential Cryptanalysis 20103575 Jung Daejin 20103453 Lee Sangho.

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 CPA by Biham & Shamir  Analyze the differences to find a secret key from r-round iterated block cipher (particular pairs of plaintexts, corresponding ciphertexts)  Difference ( △ X = X ⊗ X *-1 )  i-round Differential ( α, β ) ( △ X= α, △ Y(i)= β ) Differential Cryptanalysis (1)

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