>>We don't know whether Moises just wants to degrade the image to a point where it is recognizable but un-usable or where he wants to make it completely scrambled in the encrypted state.....
No. It's easy enough to add more character substitutions which will prevent useful viewing by most people.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
