Delta Cipher

[Fontanellean]

I think there have been a few discussions of ciphers that employ character-to-character transitions to encode information

Also your verbose self-citation cipher: You are not allowed to view links. Register or Login to view.

It works on the idea that information is in "which characters are dropped and added". Very difficult (impossible?) to rule out.

That is exactly the sort of family of ciphers I had in mind: Encoding by letters added or dropped from the previous word, making the meaning of a given word dependent on the previous word. There are many different ways that could work, but it's a theory that to me seems attentive to many of the properties the text needs to have.