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X-Original-To: cryptography@metzdowd.com Date: Sun, 05 Jan 2014 18:39:47 +1300 From: Peter Gutmann <pgut001@cs.auckland.ac.nz> To: watsonbladd@gmail.com, zenadsl6186@zen.co.uk In-Reply-To: <52C702BB.3070500@zen.co.uk> Cc: leichter@lrw.com, alan.braggins@gmail.com, cryptography@metzdowd.com, gnu@toad.com, jthorn@astro.indiana.edu Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com Peter Fairbrother <zenadsl6186@zen.co.uk> writes: >One technique I'm told is still in use is to affix glitter in random patterns >in clear epoxy to missile and/or warhead parts, then shine lights on it from >variable positions and compare the return sparkle images to a known set for >that patch. Very hard to forge. This was developed over a number of years in the 1980s, read using an embedded x86 system programming in Pascal (an impressive piece of image processing for the time). It was just getting ready for deployment when the Soviet Union collapsed, and was replaced by a mechanism that was described to me as "magic marker on the side of the missile". There were some (hard-to-find) papers published on it after the project was canned, it was basically PUFs two decades before they were called PUFs. Peter. _______________________________________________ The cryptography mailing list cryptography@metzdowd.com http://www.metzdowd.com/mailman/listinfo/cryptography
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