| Have you seen the technique used at http://www.griddatasecurity.com ? Sounds
| a lot like your original idea.
Nah - more clever than what I had (which was meant for an age when you
couldn't carry any computation with you, and things you interacted with
on a day by day basis didn't have displays).
GridCode's idea is quite clever, but the fact that it's ultimately a
simple substitution - a varying simple substitution, but of a fixed
value - seems dangerous. No obvious (to me!) attacks, though....
-- Jerry
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