3. (40 points) Consider the classroom computers. Suppose has the following policy: In order to use a computer in the class room, you must type in a password that was set up earlier Suppose you can choose to use whatever cryptographic tools we have studied (contrasting Homework I in which you used symmetric-key encryption alone (20 points) One design is the following: Storing all users’ passwords in each classroom computer. Give a detailed design of
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