Question: Applied Cryptography Let _1 = (Gen_1, Enc_1, Dec_1) and _2 = (Ger_2, Enc_2, Dec_2) be two encryption schemes for which it is known that at

Applied Cryptography

Applied Cryptography Let _1 = (Gen_1, Enc_1, Dec_1) and _2 = (Ger_2,

Let _1 = (Gen_1, Enc_1, Dec_1) and _2 = (Ger_2, Enc_2, Dec_2) be two encryption schemes for which it is known that at least one is CPA-secure. The problem is that you don't know which one is CPA-secure and which one may not be. Show how to construct an encryption scheme II that is guaranteed to be CPA-secure as long as at least one of _1 or _2 is CPA-secure. Try to provide a full proof of your

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