5.2, 5th paragraph

[nathanhere]

Would it be helpful if this paragraph were removed? Wasn't sure what it added to the conceptual understanding that wasn't already stated or that couldn't be quickly grokked by the image example.

If not, consider:

Instead of: "Because identical blocks of pixels in the input map to"

Perhaps consider: ""Because identical blocks of pixels in the input will map to"

I got confused thinking this was one concept--an "input map".

[lvh]

I'd like some text that keeps it together, but I do agree that your wording is less confusing; I've made the change and also used "plaintext" and "ciphertext" instead of "input" and "output".