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: (2 marks) The encryption function, f(x) = (5x+12) mod 26, was used to encrypt an 8-letter plaintext using Z26 encoding for each letter (ex:

: (2 marks) The encryption function, f(x) = (5x+12) mod 26, was used to encrypt an 8-letter plaintext using Z26 encoding for each letter (ex: a=00, b=01, ... , z=25). The resulting ciphertext is "letdedse". Find the original 8-letter plaintext

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