Secret key shared by sender and recipient Secret key shared by sender and recipient * Transmitted ciphertext Y = EK, X) x =DIK, Y1 Plaintext Plaintext input Encryption algorithm Decryption algorithm output (reverse of encryption algorithm) Identify the type of cryptosystem from the above and list the main objective of it Differentiate the process style of DES and AES. What is the key length of AES with 12 rounds