Problem
1. Advanced Encryption Standard (AES) is a new modern block cipher. Use the literature to learn about it and compare and contrast it with DES. Is AES a Feistel or a non-Feistel cipher?
2. Another asymmetric-key cipher is called ElGamal. Use the literature to find out about it and compare it with RSA.
3. Use the literature to find the outline of the HMAC similar to the one for MAC.