How about 256 words (or sets of words) representing each byte value? It's less dense by a factor of ~5, but it would work, be easy to decode, and be very diffic

How about 256 words (or sets of words) representing each byte value? It's less dense by a factor of ~5, but it would work, be easy to decode, and be very difficult to identify, especially if you used sets of words. You could even cleverly generate in a way that is grammatically correct.