Question 1 Substitution and Transposition Ciphers [15 marks] a) Let X be your first 8-digit student ID. Consider X as an integer. Given plaintext "MULTIMETAVERSE" and secret key, X2mod26, encrypt this plaintext using Caesar Cipher. If X2mod26=0, use 7 as the secret key. [5 marks] b) Suppose Y is the first 10 letters of your name in lowercase in the form of "> ", e.g., "chantaiman", where "chan" is the last name and "taiman" is the first name. Also, the secret key, K, is "blneifqsvwxkyrutjadzoghpmc". Using monoalphabetic substitution cipher, encrypt Y. If your name has less than 10 letters, append it with sufficient number of the letter, ' x '. [5 marks] c) Given plaintext "kungheifatchoy", encrypt the plaintext using row transposition cipher. The key is 3124 . [5 marks]