Re: Chart based encryption
There are lies, damn lies and statistics indeed.
They are a number of books that nicely illustrate (sorry) this point, about how presenting data in new and interesting ways can highlight (or disguise) different aspects of it. Things like The Visual Miscellaneum are a great way to demonstrate how infographics can show data in new ways.
Basically - trust the numbers, not your instinctual reaction to a large red pie-section.
And, yes, I'm a mathematician. You shouldn't trust us either. We have a way of being 100% accurate, while also being at least 98% misleading at the same time.