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Consider our authentication protocol 4.0, in which Alice authenticates herself to Bob, which we saw works well (i. e., we found no flaws in it.). Now suppose that at the same time that Alice authenticates herself to Bob, Bob must authenticate himself to Alice. Give a scenario by which Trudy, pretending to be Alice, can now authenticate herself to Bob as Alice.

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Consider our authentication protocol 4.0, in which Alice authenticates herself to Bob, which we saw...
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