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1. Describe and critically discuss the Authentication Header (AH) and Encapsulating Security Payload (ESP) services. Can AH protect all the fields? 2. Discuss and

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1. Describe and critically discuss the Authentication Header (AH) and Encapsulating Security Payload (ESP) services. Can AH protect all the fields? 2. Discuss and critically evaluate the following public-key encryption protocols for secure electronic mail: a. Protocol 1 AB: EU [K]|| K, [M] b b. Protocol 2 AB: M|| ER [H(M)] c. Protocol 3 ABE [M|| EKR [H(M)]]

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