Question: Assume Alice is using the ElGamal cryptosystem to securely send a message to Mr . B . Given a prime number q = 2 3

Assume Alice is using the ElGamal cryptosystem to securely send a message to Mr. B. Given a prime number q=23, the generator is \alpha =5, the private key of Mr. A X_A=9, the random integer k =13 and the message is M =7, please generate the ciphertext (C1, C2).
Note: Please use the Square-and-Multiply algorithm when calculating modular exponentiation.

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