Running key cipher: Difference between revisions

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Latest revision as of 08:50, 11 November 2024

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== Example ==

The key text used is a portion of ''[[The C Programming Language]]'' (1978 edition), and the ''[[tabula recta]]'' is the tableau. The plaintext here is "Flee at once".

Page 63, line 1 is selected as the running key:

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The message is then sent as "JCVSR LQNPS". However, unlike a [[Vigenère cipher]], if the message is extended, the key is not repeated; the key text itself (the text from the ''[[The C Programming Language]]'') is used as the key.{{Clarify|date=November 2023}}and can be extended for any arbitrary length. If the message is extended, such as, "Flee at once. We are discovered", then the running key continues as before:

{| class="wikitable" style="text-align:center"