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Lei chooses the primes 17 and 13, and an encryption key which is relatively prime to...

Lei chooses the primes 17 and 13, and an encryption key which is relatively prime to φ(17*13) = 192. He chooses 7. He posts his parameters (7, 221). Then he receives the encrypted message 72 from Bai. What is the plaintext version of this message

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