3 ms·
Check out Deconvolution[1]) The technique has been done before and the text string of the private key would probably be the easiest point of attack. WHY BLURR
by DINKDINK 9y ago
Check out Deconvolution[1])
The technique has been done before and the text string of the private key would probably be the easiest point of attack.
WHY BLURRING SENSITIVE INFORMATION IS A BAD IDEA[2]
RESTORATION OF DEFOCUSED AND BLURRED IMAGES[3]
Take away: black out any and all sensitive information. Blurring just marginally reduces the independence of the bits presented in blurred output. To have privacy, all dependence must be eliminated, e.g. black out.
[1] https://en.wikipedia.org/wiki/Deconvolution https://en.wikipedia.org/wiki/Deconvolution
[2] https://dheera.net/projects/blur https://dheera.net/projects/blur
[3] http://yuzhikov.com/articles/BlurredImagesRestoration1.htm http://yuzhikov.com/articles/BlurredImagesRestoration1.htm
- 3pt14159 9y agoIn addition to just blacking out, it's also important to screenshot the content if you are able to and then black it out. Otherwise you may leak meta data or pre-rendered thumbnails. The reason you screenshot first and black out second is that it reduces the chances of you mixing up which file to upload.
- derefr 9y agoAlso, even more basic: don't just redact a PDF by adding black boxes over the text as a new layer. The text data is still there. (Yes, this has been a source of leaks on numerous occasions.)
- artursapek 9y agoShoulda told the FBI that years ago!
- lysp 9y agoSimilar thing happened in Australia recently. Every member of parliament and senators have their phone bills published to the government website as part of public disclosure. What happened though is instead of deleting their phone numbers, the contractor who was in charge of this simply changed the font colour of their phone number to white (same as the background). So if you looked at the PDF, it looked normal. If you highlighted the text - the phone number instantly showed up. Also viewing google "text" cache version showed the number too. As a result - hundreds of their personal phone numbers were available to anyone and everyone. http://www.smh.com.au/federal-politics/political-news/private-mobile-phone-numbers-of-nearly-every-federal-mp-accidentally-published-online-20170320-gv1x85.html http://www.smh.com.au/federal-politics/political-news/privat...
- sillysaurus3 9y agoA criminal was caught after they released their own picture with a swirl filter applied to their face. Unfortunately for the criminal, a swirl is reversible.
- oh_sigh 9y agoNot just any criminal but a big time pedo