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Each page is a new cypher.
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When you broadcast something,
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the agent matches up the first set of numbers
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to the page in the notebook.
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Now he knows he's using this page,
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and this page only, to decode the message.
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When he's done, he destroys the page.
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So we send another broadcast
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to cancel this one.
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Every cypher's a one-time deal.
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Totally random.
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Completely impossible to crack the code