A century ago, telegraph or cable codes (aka Commercial Codes) were a method for reducing telegraph costs (they charged per word) and increasing what we now call data security. Technically they were non-secret codes, resolving to commercially available books. But many books wee private and as indecipherable as any OTP. At it's peak there must have been more than a hundred unique codes in use. You can see my current list here. Or buy books below!
The Adams Cable Codex (1896) LINK
The Lumberman's Standard Telegraph Code (1896) LINK SOLD!
The Standard Cipher Code of the American Railway (1906) LINK SOLD!
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