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If the book cipher refers to words as opposed to letters then the book cipher could be made more secure by the different ciphers refering to the same word. Therefore where a word appears more than once in the book likely use a different reference to it. Another way of making it more secure is not to use a book in your native language for example an ...


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The only way for this cipher to be secure these days is to use a truly random running key that is the same size or larger then the plaintext. Then to never ever use that same key again. This makes the cipher a One-Time Pad which is the one cipher that is truly unbreakable. But key generation, management, and storage would be extremely difficult.



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