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As it is, there is not enough information, in particular on functions A and B, to answer. However, here are elements that may help: Is the above function using A and B a pseudorandom function as it is using LFSR to produce cipher text? As mentioned in the comments, even if the LFSR does outputs completely random numbers (which I doubt), there is ...


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The simplest way to demonstrate the difference is with an encryption scheme that is deliberately broken to an adaptive-chosen-plaintext attack. Take any encryption scheme. Now lets add a stupid testing/validation feature. If the first 4 characters of the input is "test", it takes the next byte as a bit-length value. Then it takes that number of following ...


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The usual approach to prove IND-CPA security is to construct a logical argumentation called "reduction". In this argumentation you first start with the assumption that certain computational problem is hard (for example, the Decisional Diffie-Hellman assumption), and then you proceed to demonstrate that if your crypto scheme were insecure with respect to IND-...



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