DES

Write a 2–3 page paper that answers the questions below. Be prepared to fully support your answers. Explain in your own words the following:

•What is the history of DES, and why is s-DES studied?

• How does DES and 3DES work? Provide an example of each.

• Explain the following ingredients that decide the algorithm in the Fiestel cipher:

◦Block size Key size
◦Sub key generation
◦Round function
◦Fast software encryption/decryption
◦Ease of Analysis