Question: 4. (a) What is non-repudiation? (2 marks) (b) Why does not the symmetric protocol provide any non-repudiation guarantee? (9 marks) () Why is the asymmetric

4. (a) What is non-repudiation? (2 marks) (b) Why does not the symmetric protocol provide any non-repudiation guarantee? (9 marks) () Why is the asymmetric protocol much better than the symmetric one from the perspective of non-repudiation? (9 marks)

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