Question: Let X = 2023, Given the secret key (X mod 13) + 1 and the plaintext digitalsignature, encrypt this message using the Addictive Cipher.

Let X = 2023, Given the secret key (X mod 13) + 1 and the plaintext digitalsignature, encrypt this message using the Addictive Cipher. (5 marks) Q2. Given secret key = new, encrypt the message happybirthday using Vigenere cipher. Q3. Given p = 11,q=1 9 and using Rabin cryptosystem. a. Encrypt message=200. (5 marks) (5 marks) b. Decrypt the ciphertext you get from a) and discuss how to make sure the uniqueness of the decryption. Q4. Consider the ElGamal encryption you have studied in the lecture. Parameters: a prime p, a generator g, a random number u, let y = gu mod p. Public key: p, g, y Secret key: p, g, u Encryption of message M: - Choose a random number k

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