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I entered an underhanded contest one year where the challenge was recoverable-but-correct-looking redaction of jpegs. I used an insecure random seed based on the time (you could brute force an unredacted image based on the rough time it was generated). The winning solutions were more clever

You (and I) were among the many which implemented that exact technique for http://underhanded.xcott.com/?page_id=17 . :)

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