dheera.net— Good article on why this is not secure. Includes a "blurred check" example with some of the mathematics behind it.
Jan 6, 2007View in Crawl 4
Very silly. Isn't it obvious to just pick the eraser icon and uhh erase the sensitive material instead of putting layers over it. This is obvious to me who doesn't even use photoshop.
That's actually really interesting. I know a hell of a lot of people who just blur all their personal info, and I always thought it was kind of unsafe. Nice to have some proof.
The article has glossed over a few details though. I presume this is based on the Lucy-Richardson algorithm for deconvolution (de-blurring for the uninitiated). For this to work, the blur has to Gaussian, though it should not be too difficult to tweak it for motion blur. Also, adding blur multiple times or adding noise before/after the blur would render the algorithm more or less useless.Deconvolution is an incomplete problem. Mathematically, that means there is more than one solution. My point is, this is not as easy as it is made out to be.
Closed AccountJan 7, 2007
Very silly. Isn't it obvious to just pick the eraser icon and uhh erase the sensitive material instead of putting layers over it. This is obvious to me who doesn't even use photoshop.
alpharobJan 7, 2007
That's actually really interesting. I know a hell of a lot of people who just blur all their personal info, and I always thought it was kind of unsafe. Nice to have some proof.
Closed AccountJan 7, 2007
pointless
confusinatorJan 7, 2007
Exactly, that's what I've always thought.
meprisantJan 7, 2007
The article has glossed over a few details though. I presume this is based on the Lucy-Richardson algorithm for deconvolution (de-blurring for the uninitiated). For this to work, the blur has to Gaussian, though it should not be too difficult to tweak it for motion blur. Also, adding blur multiple times or adding noise before/after the blur would render the algorithm more or less useless.Deconvolution is an incomplete problem. Mathematically, that means there is more than one solution. My point is, this is not as easy as it is made out to be.
dtfinchJan 7, 2007
The article was about brute forcing pixelated text.
ccheathDec 13, 2007
yeah i saw that one too