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James Bond, a British spy, is at a party where he is to make contact with a woman whose husband is an international drug dealer.
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James Bond, a British spy, is at a party where he is to make contact

with a woman whose husband is an international drug dealer. The woman has agreed to report to Bond, through secure e-mail, the activities of her husband. During the party, Bond secretly slips the woman a piece of paper that contains 256 apparently random characters. This will be the cryptographic key that they will use to secure their communications. Next, Bond easily beats the husband at a game of Trivial Pursuit and then leaves the party. Later, Bond receives a message from the woman, but the information is so unexpected that he doubts that she was the person who actually sent it. He contacts you, Her Majesty's cryptographic expert, and asks how he can be completely confident that the message was sent by the person to whom he gave the 256-bit key. What is your response? Explain your answer in terms that a layman like Bond can understand.

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