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You think the technique mentioned in the article doesn't leak data? It actually leaks more data than a gaussian blur.

Gaussian blur suffers from exactly the same problem, although a different difference function is needed for it.




Gaussian blur is equivalent to an auto key cipher [0] without a key. Each pixel is composed of a couple pixels from the original. With some simple algebra, cross-examining pixels that have values determined by the same origin pixel, you can reverse the operation.

[0] http://en.m.wikipedia.org/wiki/Autokey_cipher


I see that I deserved a schooling on gaussian blur, but

  > You think the technique mentioned in the article doesn't leak data? 
yes, I do think it leaks data, which was the correct half of my comment, actually.

Not that it matters now, but I always assumed blurring distorted the data in way way that would make it hard to recover in practice.




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