(a) The following is the ciphertext of a statement in English encrypted with Caeser cipher: ORUBKIUSVAZKXY You have to figure out the key and the plaintext. You don't need to show any calculations, just the final result. (b) Using the monoalphabetic cipher, part of the ciphertext is the following: M AKQB DCMR TAZRR (I have left a blank space between the words to make the problem easier). The following are the approximate relative frequencies of the whole ciphertext: B:12,J:11,D:8,K:8,M:7,U:7,Z:7; R:5,F:4,L:4,A:4,C:4 You have to figure out what is the plaintext corresponding to the above ciphertext segment. You don't need to show any calculations, just the final result. (c) This question is about Hill cipher. The plaintext is "IF The key K is3 3 -2 3 24 25 1 K-1 is i. Show what the ciphertext C will be. You need to show your calculations. ii. Show the results (and calculations) of decrypting C. Remember that all operations are modulo 26