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Using the English alphabet (i.e., mod 26 arithmetic) let plaintext = {p1, p2,… , pn} and corresponding ciphertext = {c1, c2,… , cn}. Consider the encryption function is ci = pi + 15 (mod 26). If you accept the ciphertext message YPHDCRPBEQTAA, decrypt it in order to recover the plaintext. State the decryption function, and recovered plaintext? What kind of cipher is this?

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