Using the APA writing style, 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
Subkey generation
Round function
Fast software encryption/decryption
Ease of Analysis