Running key cipher: Difference between revisions

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In classical [[cryptography]], the '''running key cipher''' is a type of [[polyalphabetic substitution|polyalphabetic]] [[substitution cipher|substitution]] [[cipher]] in which a text, typically from a book, is used to provide a very long key stream[[keystream]]. Usually, the book to be used would be agreed ahead of time, while the passage to use would be chosen [[random]]ly for each message and secretly indicated somewhere in the message.

== Example ==