a) The RSA system was used to encrypt the message M into the cipher-text C = 79. The public key is given by n = 187 and e = 9. (4 Marks) In the following, we will try to crack the system and to determine the original message M. What parameters are common in both encryption and decryption? (1 Mark) (5 Marks) b) Implement the Columnar Transposition cipher to decrypt the following. Key 354216 Cipher text APORFPNTOVMORRIXTFOTESDMAOEOWE