2. Design a single block cipher Round that performs simple permutation, substitution, and subkey mixing. The Round has only a single permutation and a single block substitution box. The plaintext and the ciphertext must be 16 bits in size. A 16 bits input subkey must be mixed within the round using a round function F. Accordingly, present your design and solution of the following requirements and justify your selection in terms of adequacy of purpose: a. A stage of permutation. b. A single block substitution box (S-Box). Trace the output for an input of IN = (1A12) hex. c. A Round Function using a modular arithmetic operation with an adequately matching modulus value. Trace the output of the Round Function an input IN and a subkey SK, where IN = (1310) hex and SK = (2C1E) hex. d. If the designed single round is replicated to create a block cipher, propose a key size. Justify your choice. e. Suggest three scenarios for making the designed components in parts (a), (b), and (c) more secure