2) A block cipher is a deterministic algorithm operating on fixed-length groups of bits, called a block. Please answer the following questions regarding block ciphers. a) Partial credit1: Two canonical examples of block ciphers are 3DES and AES. Please determine the number of input bits and key bits for each of them. [1 point] 3DES: Number of input bits: Number of key bits: AES: Number of input bits: Number of key bits: {0.1in. b) Partial credit 2: How Encryption algorithm in DES works? Given functions fi, please complete the Encrption schematic vie and the following equationI point] , fa: {0,1} d-1 d-1 1 of 3 input