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2. John has arranged a blind date for Kelly and Brendan. They are both cryptographers and they didn't know each other before. John has given

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2. John has arranged a blind date for Kelly and Brendan. They are both cryptographers and they didn't know each other before. John has given Kelly and Brendan a secret number K and nobody else knows K. Brendan wants to make sure that the person he is dating is actually Kelly, not somebody else. Explain how cryptographically Kelly can prove herself without revealing the secret number K

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