Comments by "0x777" (@0x777) on "Dark5"
channel.
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It is actually much simpler than that. The numbers represent codes found in a book. The agent has said book with him and of course has to keep it secret. In this book, there is a load of number combinations (or letter combinations, depending on the style used). For example 43526 52351 could mean "lie low for a while, we think they are onto you". This combination is transmitted once, and only once, ever. So other combinations mean the same thing, in case a certain message has to be sent again. That way, someone eavesdropping cannot infer from the message and potential behaviour what the message contained.
In case a nonprepared message has to be transmitted, a one time pad is being used. This is, in its simplest form, a string of numbers that you would have to add to the encrypted message to get the clear text. Unless it is reused (which it obviously should never be) this is not breakable. And I don't mean "so unlikely to get the key that you'd need a billion cloud computers...", I mean UNbreakable. For obvious reasons.
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