> It's an algorithm, so you're probably looking for a higher level block diagram or something like a pseudocode explainer?

Not so much. What I'd really like is a differential design analysis, i.e. "if it didn't do [this step], then the output distribution would look like [graph] instead of [graph], or it would be vulnerable to [attack]" or "if, instead of doing [step] here, it did [other step], then we would have what is known as the [some other algorithm]."