Laser Surface Authentication TM : biometrics for documents and goods
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1 Laser Surface Authentication TM : biometrics for documents and goods Professor Russell Cowburn Professor of Nanotechnology, Department of Physics, Imperial College London, UK. Chief Technical Officer, Ingenia Technology Ltd, London, UK. R.Cowburn@imperial.ac.uk 1
2 Summary Using laser optics to determine a fingerprint from documents and packaging For identifying fraud in: valuable documents; ID cards, access control, authentication packaging of branded goods. and for low-cost, item-level, covert track & trace. 2
3 Overview Principle of operation A live demonstration Results of a small scale trial Potential applications and advantages 3
4 Principle of operation Try to identify the equivalent of a fingerprint, iris-scan, or other biometric of a document or packaging, for item-level self tagging. Base this biometric on naturally occurring microscopic randomness that cannot be controlled by anybody. Intrinsically read only. Read the random biometric and store it in a database. To verify authenticity, re-read the fingerprint and compare it with the database original ( closed loop authentication ). Additionally, the fingerprint can be cross-referenced with other information or data bases. 4
5 Two key questions 1. Do paper and other surfaces have naturally occurring randomness? 5
6 A microscopy image of paper 6
7 A microscopy image of a plastic card surface Atomic Force Microscopy 100nm 7
8 Two key questions 1. Do paper and other surfaces have naturally occurring randomness? 2. Can we measure it cheaply and portably? Laser speckle allows the 3-dimensional surface to be probed with sub-micron resolution 8
9 Optical geometry Laser diode and collimator Cylindrical lens Motion direction Photodetector Document surface 9
10 Optical geometry 10
11 A typical paper scan 1 1 Change in reflectivity (%) Position (mm) Position (mm) 11
12 Cross correlation between 2 scans Fraction of bits matching Positional shift ( m) Different documents Positional shift ( m) Same document 12
13 A demonstration 13
14 Results of a small scale trial 30, Count 25,000 20,000 15, different items 124,500 different pairs 100% identification 10, ,000 = different objects paired Fraction of bits matching = same object rescanned 14
15 Number of degrees of freedom 20,000 15,000 p=0.504 N=1684 Count 10,000 5, Fraction of bits matching 15
16 Results of a small scale trial Count 30,000 25,000 20,000 15,000 Uniqueness different items 124,500 different pairs 100% identification 10, ,000 = different objects paired Fraction of bits matching = same object rescanned 16
17 Scanning speed Scanning speed is determined by how quickly the scan head can be made to move with respect to the object For low-cost, portable, hand-held scanners, scanning takes ~2 second. If the object is already moving (e.g. on a production line), linear speeds of 4 metres per second are possible. 17
18 Pharmaceutical production line 18
19 Database requirements Between 125 and 750 bytes are required to store each fingerprint. A standard PC could store around 300 million fingerprints. Alternatively, the fingerprint can be stored on the document using an encrypted / digitally signed 2D bar code, smart chip etc. 19
20 Results of robustness testing Crumple test Water test 20
21 Results of robustness testing Scorch test Scribble test Biometric was still clearly readable after damage 21
22 Applications and advantages The technology has been tested on plain paper, cardboard, passports, credit cards, boxes of perfume, boxes of pharmaceuticals, plastic and metals. All exhibit LSA signatures that can be read by our technology. The technology can be applied retrospectively to existing documents and packaging, without any special treatment or modification. Fingerprint can be stored on a remote data base which can be interrogated in the field using a mobile phone data service. Low cost No tags or chips to pay for or to become detached Covert for grey market tracking Privacy neutral 22
23 Further information Ingenia Technology Ltd Prof. Russell Cowburn Fingerprinting documents and packaging, Buchanan, Cowburn et al. Nature 436, 475 (2005) 23
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