Graphic encryption
Andrew Loewenstern
andrew_loewenstern at il.us.swissbank.com
Fri Oct 6 10:35:53 PDT 1995
> Is there anything particular in graphic encryption? I usually
> encrypt graphics and document images as regular files with regular
> encryption...
I believe graphic encryption outputs a valid image file that is apparently
white noise until you perform the decryption transformation on it. An
obvious way to do this with a non-lossy file format is to encrypt pixel vales
with a stream cipher. Another way to make the image unviewable would be to
shuffle the pixels or rasters with a PRNG.
andrew
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