Running key cipher: Difference between revisions

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== Example ==
 
Suppose we have agreed to use ''[[The C Programming Language (book)|The C Programming Language]]'' (1978 edition) as our text, and we are using the ordinary ''[[tabula recta]]'' as our tableau. We need to send the message 'Flee at once'.
 
First, we choose a starting point. Let us choose page 63, line 1: