Ordinary piece of paper, under a microscope

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	Ordinary piece of paper, under a microscope

infidel70

3-13-2009 11:21 AM

671 views

tags:

fingerprint, authentification, counterfeiting

infidel70 says:

Every sheet of paper has a unique 'fingerprint'

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/b5eb4f9e-0469-42fe-a8ba-d744f58f2b3c/64F0A7B4-02B7-4062-9A75-6A6E61B6F2F5/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners" href="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners" style="font-size: 11px;">freedom-to-tinker.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners"><P>Viewed under a microscope, an ordinary piece of paper looks like this:</p> <P><IMG src="http://citp.princeton.edu/fingerprinting/paper_images/paper_microscope.png" /></P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners"><P>The microscope clearly shows individual wood fibers, laid down in a pattern that is unique to this piece of paper.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners"><P>If you scan a piece of paper on an ordinary desktop scanner, it just looks white.   But  pick a small area of the paper, digitally enhance the contrast and expand the image, and you see something like this:</p> <P><IMG src="http://citp.princeton.edu/fingerprinting/paper_images/0Degrees-portrait.png" /></P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners"><P>Here is a visualization of surface shape from one of our experiments:</p> <P><IMG src="http://citp.princeton.edu/fingerprinting/paper_images/sum.png" /></P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners">The bottom-line result is a sort of unique fingerprint for each piece of paper, which can be determined using an ordinary desktop scanner.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners">This paper presents a novel technique for authenticating physical documents based on random, naturally occurring imperfections in paper texture. </blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners">From this physical  feature, we generate a concise fingerprint that uniquely identifies the document.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://freedom-to-tinker.com/blog/felten/fingerprinting-blank-paper-using-commodity-scanners">Our technique is secure against counterfeiting and robust to harsh handling; it can be used even before any content is printed on a page. </blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/64F0A7B4-02B7-4062-9A75-6A6E61B6F2F5/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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