- You are of course completely correct and I have removed the reference to ROT-13 as erroneous. If anything ROT-13 is a base 26 key with a value of 13 repeated applied to the text through modular addition. In the future please feel welcome to click the "edit" button at the top of any page and make any correction or improvement that you feel will improve the encyclopedia. Please leave an explanation of any such edit in the "Edit summary" box. I know it has been almost a year since you posted that, but perhaps you will see this reply nonetheless. Chillum 00:50, 25 September 2009 (UTC)
Combination with book cipher?
Is there any knowledge or experience how secure an encryption would be that combines book cipher and XOR? Like: State a random offset in a shared file (that is owned by sender and receiver), then XOR any byte of the message byte by byte with each subsequent byte of the shared file (starting at offset)...
A variant exists to systematically produce a nonzero cyphertext, which is useful for Null-terminated strings: In this one, whenever the key and plaintext have the same letter, simply copy that letter to the output instead of zero. Medinoc (talk) 20:41, 21 June 2011 (UTC)
Why I changed the Python example
The Python example, as it was this morning, was both over complicated and illustrated the problem rather sub-optimally. A key aspect of this scheme is that the encryption function is its own inverse. But that wasn't true in the Python, which had different encrypt and decrypt functions. This was needed because it used strings to represent plaintext and bytearrays to represent keys and ciphertexts. There's no need for that; it works perfectly well for strings alone. So the version to which I've changed it does away with bytearrays and uses only strings, and thus has only a single function for xoring strings together. 220.127.116.11 (talk) 18:04, 28 January 2014 (UTC)
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