This is a really neat demo! That said, wouldn't this be extraordinarily inaccessible to users employing screen-reading software? They'd "hear" a jumble of characters.
This would be horrible for any one using screen readers. You could use something like longdesc but then you've ruined your obfusciation. Really not something one should apply in production.
The only saving grace for this might be in internal sites where you want to display information to the user but do not want that user copy/pasting sensitive information into emails/chat/ect.
The only saving grace for this might be in internal sites where you want to display information to the user but do not want that user copy/pasting sensitive information into emails/chat/ect.