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Can you modify the encryption specified in §5.2.3.2 mixing in the plaintext so that instead of bi = md(kab|ci-1) we use bi = md(kab|pi-1)? how do you decrypt it? why wouldn't the modified scheme be as secure?

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Can you modify the encryption specified in §5.2.3.2 mixing in the plaintext so that instead of bi =...
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