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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.


I believe you need a few clarifications to answer this question yourself. The first is the one time pad (OTP). This is the only truly unbreakable system if it's used correctly. Using correctly means that for every symbol of the message there is exactly one truly random symbol in the key. Specifically, this means that there is no chosen symbol of the key ...

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