Part 1

a. How to encrypt a message using classical cryptography algorithms we covered in class? Are these methods secure?

b. How to decrypt a message using classical cryptography

algorithms we covered in class? What method is the best if

you want to quickly decrypt the message?

Part 2

a.How to encrypt a message using block cipher algorithms we

covered in class? What are the similarities and differences

between those algorithms?

b. How to encrypt a message using a stream cipher?

c. Compare and contrast block cipher and stream cipher.