[24 pl 3) Block Cipher Design Principles and AES a) What is the basic design technique, which is frequently used to construct modern [4pl [6pl c) Given the example of AES, which functional steps enable achieving these symmetric ciphers? b) What are the main security properties achieved via this designed technique? properties? Please provide specific names of these operations and briefly explain 10pl how they are applied in AES? [4p] d) What is special about AES S-Boxes, compared to that of DES