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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 sa
by ekr 12y ago
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.
- goldenkey 12y agoGaussian 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 http://en.m.wikipedia.org/wiki/Autokey_cipher
- Udo 12y agoI 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.