13:20 A simple way to define the uniqueness of the paper | |
| U.S. security experts have found a simple way to reliably determine the uniqueness of the paper with a cheap consumer scanner. They proved that even at 600 dpi is possible to identify the structure of a clean sheet of paper and build on it based on 3D-model, which will be unique to that particular page. The technology can be widely used for authentication of paper documents, including passports, banknotes, tickets, etc. In addition, the technology can be used to determine the true origin of the "anonymous" paper artifacts, such as ballots in the ballot box. Here is a piece of paper under a microscope. Visible from wood fibers that form a unique pattern. If you scan a sheet on a standard household scanner, the image will appear white, but if we choose a small portion of the image and adjust the contrast, the result will look like this. The dark areas are formed, where because of the structure of paper is formed from a lamp shade scanner. If you turn the page and scan again, then the shadow will fall at a different angle. This allows us to draw three-dimensional model of the surface area of ??paper. For example, if the sheet contains the text printed in a laser printer, the areas with the toner particles will clearly rise above the surface. The results of their work, scientists have published in the "Fingerprinting Blank Paper Using Commodity Scanners", which will be published in the May issue of the journal "Proceedings of the IEEE Symposium on Security and Privacy". via Freedom to Tinker (the blog of one of the authors of the study) | |
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