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How we found rogerkver’s obfuscated wallet private key

301 点作者 monort超过 7 年前

8 条评论

abstractbeliefs超过 7 年前
This is a great reminder to follow the advice of a previous article here about the blurring of sensitive data.<p>1) If you care about the data, don&#x27;t blur. Black it out, entirely. 2) If you don&#x27;t want to black it out for aesthetic reasons, then you don&#x27;t care enough about the data being private. 3) Black out every pixel, every time.
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DINKDINK超过 7 年前
Check out Deconvolution[1])<p>The technique has been done before and the text string of the private key would probably be the easiest point of attack.<p>WHY BLURRING SENSITIVE INFORMATION IS A BAD IDEA[2]<p>RESTORATION OF DEFOCUSED AND BLURRED IMAGES[3]<p>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.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Deconvolution" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Deconvolution</a><p>[2] <a href="https:&#x2F;&#x2F;dheera.net&#x2F;projects&#x2F;blur" rel="nofollow">https:&#x2F;&#x2F;dheera.net&#x2F;projects&#x2F;blur</a><p>[3] <a href="http:&#x2F;&#x2F;yuzhikov.com&#x2F;articles&#x2F;BlurredImagesRestoration1.htm" rel="nofollow">http:&#x2F;&#x2F;yuzhikov.com&#x2F;articles&#x2F;BlurredImagesRestoration1.htm</a>
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ajnin超过 7 年前
Gaussian blur is mathematically reversible, but in practice you don&#x27;t have enough resolution to successfully deconvolve the original image. However in the case of video you have multiple images and you can reconstruct a &quot;super-resolution&quot; image by combining frames. I&#x27;m sure there is a tool somewhere that can do this, there are too many secrets being shown blurred on TV to pass ...
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patd超过 7 年前
Congrats.<p>I had also started trying to decode the QR but as I was starting to look into the ECC I noticed someone had moved half of the coins and gave up.<p>Glad you explained your technique. I initially used a Picross editor to map the screenshot before moving to a full Python script.
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alanfalcon超过 7 年前
This was a great story which previously didn&#x27;t hit the front page. I&#x27;m glad for the re-submit policy. I enjoyed learning about the build structure of QR codes. Years ago I chose to learn how barcodes are constructed so that I could create custom barcodes for my college library. Having access to nothing more than Microsoft office, I naively decided that a whole lot of conditional formatting rules would be enough to build the thing in Excel. And I was right! But it&#x27;s not a method I would recommend anyone ever attempt.
zaroth超过 7 年前
My biggest take-away from all this -- look at how much high quality engineering work was just crowdsourced for $1,000?!
IshKebab超过 7 年前
It doesn&#x27;t look very blurred. I expect you could do a blind deconvolution and just read it.
Bromskloss超过 7 年前
I was hoping for some application of Bayes&#x27; theorem.