What is impact on secrecy of previously exchanged messages

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Question: Two parties, A and B, need to perform encryption. They have one symmetric key between them. An intruder acquires knowledge of the key. What is the impact on secrecy of previously exchanged messages? What would be the impact on secrecy of future messages? Is there any harm in A sending a plaintext message to B saying the key is no longer secret? Should A send that message encrypted with the now-exposed key? Explain your answers.

Reference no: EM133427852

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