Voynich Reconsidered

[Mark Knowles]

I never quite sure precisely what people mean when they use the term "substitution cipher". Do they just mean a cipher when each letter is substituted with a letter or symbol? Or do they include a more complex cipher with homophones, nulls, substring substitutions, word substitutions etc.

Mark,

While looking for something else, i came across the following book chapter on enciphering methods -- it's discussion of the different types of substitution ciphers probably answers your question in a more authoritative way relative to standard usage: You are not allowed to view links. Register or Login to view.

Karl

It clarifies what is meant by a simple substitution cipher, which is what I guessed. Some aspects of what I have described are not referred to. This accounts for my use of the term "diplomatic cipher" given its more specific correspondence.