What is the difference between diffusion and confusion? $($Professor Messer$)$ In Confusion, the encrypted data is drastically different than the plain text, and the process should be non$-$linear with no discernible patterns. There is no difference between Confusion and Diffusion. In Diffusion, if you change one Character of the plain$-$text, the cypher text will not be any different. Ciphertext and plain text cannot be catagorized as Diffusion and Confussion.