Question

We have considered encryption, and in particular, the algorithm and underlying theory of the Advanced Encryption Standard (AES).
3.1. What is the Advanced Encryption Standard?
3.2. What is a Certificate Authority?
3.3. What is meant by a public key and how is such a key used?
3.4. Consider a very simplified model of AES in which there will be only one P box and one S box and an 8 bit key. Use 0xBC as the key. Show, step by step, how one encrypts the string T h e (without any embedded blanks) assuming that each letter is from ISO, thus Ox54, 0x68, 0x65 as the octet (8 bit) hexadecimal values.

Answer 1

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