Question: (20 p) Suppose that Bob, Alice and Code share a security key, kabc. Alice need to confidentially send one signed message M to Bob and

(20 p) Suppose that Bob, Alice and Code share a security

(20 p) Suppose that Bob, Alice and Code share a security key, kabc. Alice need to confidentially send one signed message M to Bob and Code. Describe a method that use X.509 Authentication Service to do this task

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