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Re: Finding computer files hidden in plain sight
These guys alter the colour odd/even values of a successive string of pixels. So how about altering every, say, tenth pixel's value? Or there could be a simple irrational number like pi, for instance, where the digits are the spaces between the pixels that have been changed. Like 22/7, and then the altered pixel will be the third one, then one normal pixel, another altered one, then four normal pixels, then another altered one, etc. And the 22/7 would then be the 'key' needed to decrypt. There would also be a 'master' key, being the point at which the encryption started, and the 22/7 would be applied from that point forwards. Or backwards.
This is a nasty can of worms!
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its called steghide 
No I havent done it yet, its just an idea.
