Question: Computer Security Questions: Proof Perfect Secrecy Let us assume CT and PT are discrete random variables which can take values from the domain of ciphertext

Computer Security Questions: Proof Perfect Secrecy

Computer Security Questions: Proof Perfect Secrecy Let us assume CT and PT

Let us assume CT and PT are discrete random variables which can take values from the domain of ciphertext and plaintext, respectively. Let us also assume that C and M are arbitrary elements from the ciphertext and plaintext domains, respectively. Prove that for any cipher that offers perfect secrecy, it satisfies: Pr[CT = C | PT = M] = Pr[CT = C]

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