2008 Contest
The 2008 contest required entries to redact a rectangular portion of a PPM image in a way that the portion may be reconstructed. Any method of "blocking out" the rectangle was allowed, as long as the original pixels were removed, and the pixel reconstruction didn't have to be perfect (although the reconstruction's fidelity to the original file would be a factor in judging). The contest began on June 12, and ended on September 30. Entries tended to either xor the region with a retrievable pseudo-random mask or append the masked data to the end of the file format. The two placing programs both used improperly defined macros while the winner, choosing to work with an uncommon text based format, zeroed out pixel values while keeping the number of digits intact.
Read more about this topic: Underhanded C Contest
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