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Suppose Alice and Bob share a common secret key K. They want to protect their communications for both message confidentiality and integrity. Moreover, they want

Suppose Alice and Bob share a common secret key K. They want to protect their communications for both message confidentiality and integrity. Moreover, they want to ensure that breaking the security in one communication direction will not affect the security in the other direction. Design a solution for Alice and Bob to achieve the goal. Show the format of a protected message delivered in each direction in your answer.

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