Question: 2 . Token cards display a number that changes periodically, perhaps every minute. Each such device has a unique secret key. A human can prove

2 .

Token cards display a number that changes periodically, perhaps every minute. Each such device has a unique secret key. A human can prove possession of a particular such device by entering the displayed number into a computer system. The computer system knows the secret keys of each authorized device. How would you design such a device?

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