Question: Consider a polyalphabetic cipher with key CAD. Recall that a monoalphabetic key A is a shift by one alphabet position so that D - >

Consider a polyalphabetic cipher with key CAD. Recall that a monoalphabetic key A is a shift by one alphabet position so that D->E, and a monoalphabetic key B is a shift by two alphabet positions so that D->F, and so on. In this case, the plaintext BENCH becomes the ciphertex

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