Authentication system with visual encryption using polarisation of light
First Claim
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1. An authentication system including a plurality of optical authentication devices and at least one inspection device;
- each optical authentication device including an optical layer including a representation of a first image visually encrypted under control of an encryption key, where the encrypted first image uniquely identifies the respective authentication device; and
the inspection device being operative to decrypt the optical layer of the optical authentication device under control of the encryption key and to visualize the first image to enable verification of the unique identification of the authentication device.
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Abstract
An authentication system 600 includes optical authentication devices 620, 630, 640. Each optical authentication device includes an optical layer 622, 632, 642. The optical layer includes a representation of a first image visually encrypted under control of an encryption key. The encrypted first image uniquely identifies the respective authentication device. An inspection device 610 decrypts the optical layer of the optical authentication device under control of the encryption key and visualizes the first image to enable verification of the unique identification of the authentication device.
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Citations
19 Claims
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1. An authentication system including a plurality of optical authentication devices and at least one inspection device;
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each optical authentication device including an optical layer including a representation of a first image visually encrypted under control of an encryption key, where the encrypted first image uniquely identifies the respective authentication device; and
the inspection device being operative to decrypt the optical layer of the optical authentication device under control of the encryption key and to visualize the first image to enable verification of the unique identification of the authentication device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of hiding a first image in a second image in an optical layer of an optical authentication device where the optical layer includes a plurality of polarized cells;
- the method including;
obtaining a visual encryption key that describes for each cell of the area a respective rotation of a polarization of light;
visually encrypting the first image into the second image by, for each cell of the optical layer, determining a respective rotation of a polarization of light passing through the cell in dependence on a pixel value of a corresponding pixel of the second image, a pixel value of a corresponding pixel of the first image and a rotation prescribed by the encryption key for the cell;
the encrypted first image uniquely identifying the optical authentication device; and
applying the determined rotations to the respective cells of the optical layer.
- the method including;
Specification