1. Consider the following symmetric block encryption algorithm ALGO. ALGO operates on 16-bit blocks of plaintext using a 128- bit key. The plaintext is divided into two 8-bit blocks (LO, RO), and the key K is 8 bits. Encryption involves repeated application of a pair of rounds, defined as follows for rounds i and i + 1: The round key K, is determined as follows S0 Given Li Lit Here s is an xor,Is an addition modulo 28 and