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a) What does it mean for a crypto protocol to have PFS (Perfect Forward Secrecy) structure? Explain. Give an example of the PFS structure. b)

a) What does it mean for a crypto protocol to have PFS (Perfect Forward Secrecy) structure? Explain. Give an example of the PFS structure.

b) When a security protocol is designed to be considered secure, it must have a session key and double-sided authentication. Explain this sentence, why are the session key and double-sided authentication mechanism necessary to ensure security?

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