Describe five different types of viruses.

a. Describe the main properties of the Data Encryption Standard (DES). What type of an algorithm is it?
What is it used for? (4 Marks)
b. What are the length of the key and the size of the block that this algorithm uses? (2 Marks)
c. With the aid of a diagram, explain its overall operational steps (or basic steps). Your answer should
describe the initial and final operations as well as the operations that are repeated at each round, without
giving going into the specific details on how these operations are actually performed. (8 Marks)
d. What are S-Boxes and what role do they perform? (2 Marks)
e. List the different techniques that have been proposed to strengthen DES. (4 Marks)







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