Question 1:

Part 1: How to encrypt a message using classical cryptography algorithms we covered in class? Are these methods secure?

Part 2: 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?

Question 2:

Part 1: How to encrypt a message using block cipher algorithms we covered in class? What are the similarities and differences between those algorithms?

Part 2: How to encrypt a message using a stream cipher?

Part 3: Compare and contrast block cipher and stream cipher.

Solve these questions in details and provide examples to support your rationale.