Question: Question 3: [10 marks] Answer the following questions: a. Explain how DES works for encryption and decryption. (4 marks) b. In asymmetric cryptography, how can

Question 3: [10 marks] Answer the following questions: a. Explain how DES works for encryption and decryption. (4 marks) b. In asymmetric cryptography, how can Alice and Bob exchange a message, knowing that both do not know each others public key? Explain the process. (6 marks)

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