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Sender chooses p = 107, e1 = 2, d = 67, and the random integer is r=45. Find the plaintext to be transmitted if the ciphertext is (28,9).

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Sender chooses p = 107, e1 = 2, d = 67, and the random integer is r=45. Find the plaintext to be transmitted if the ciphertext is (28,9).

(a) 45

(b) 76

(c) 66

(d) 13

The question was posed to me in semester exam.

My query is from Rabin/ Elgamal Algorithm topic in portion Public Key Cryptography and RSA of Cryptograph & Network Security

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The correct option is (c) 66

The best explanation: P = [C2 (C1d)-1] mod p = 66.

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