See here for the inaugural Underhanded C contest:
http://www.brainhz.com/underhanded/
The object is to write clear, readable, innocent-looking C code that
nevertheless does something malicious. That is, you must code evil
behavior that passes visual inspection of the source by other programmers.
This contest was just announced at the Information Hiding Workshop in
Barcelona, Catalonia. For that reason, we decided that the first year's
challenge would be covert fingerprinting of images: write code that
implements some basic image-processing operation, but covertly embeds
a unique fingerprint in every image.
Mail me with questions at Xcott Craver (one word) at teh gmail.
Xcott
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"A holiday fixes up your brains.
It's like being swallowed by a wolf then punching his guts from the inside."
--Shelly Winters