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Now that we know about the one-time pad,
let's talk about making the one-time pad
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more practical using something called the
stream cypher. But before we do that,
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let's do a quick review of where we were.
So let me just remind you that a cypher is
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defined over a triple of sets called a key
space, a message space, and a cypher text
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bare space. And a cypher is a pair of
efficient algorithms called E and D; E
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stands for encryption and D stands for
decryption. And the only property. That we |
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