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US 7,353,994 B2Granted
Security, identification and verification systems
OwnerAndrew John Farrall, Keith Michael Barfootinventors
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Abstract
A method of operating a security system includes making a plurality of security tags, each of which includes a plurality of particles randomly distributed in a light-transmitting matrix, providing a reader which includes means for causing light of one or more wavelengths to impinge on a security tag and means for interpreting the light reflected and/or refracted and/or diffracted by the particles in the matrix, and presenting said tags to said reader.
Claims14
A method of operating a security system, said method comprising:
- making a plurality of tags, each of which includes a plurality of particles randomly distributed in a light-transmitting matrix;
- attaching the tags to objects to be authenticated;
- providing a reader which includes means for causing light of one or more wavelengths to impinge on a tag and means for detecting, recording and interpreting the light reflected and/or refracted and/or diffracted by the particles in the matrix so as to produce images of the particles;
- presenting said tags to said reader;
- encrypting and storing information concerning the images of at least some of the particles of a particular tag on at least one of the particular tag and the object to which the particular tag is attached;
- recalling and decrypting the encrypted image information;
- and
- comparing the recalled and decrypted image information with the image information obtained by the reader when authentication is required.
5 more elements
Dependencies are inferred from the claim text.