Speckle Pattern For Authenticating An Information Carrier
First Claim
1. A system comprising an information carrier (11) for comprising user-information (20) and an apparatus (10) for accessing the information carrier, the information carrier comprising an optical identifier (12) representing a physical one-way function and authentication information (17), the apparatus comprising:
- a light source (13) for challenging the optical identifier, when the information carrier is present in the apparatus, by generating a light beam (14) incident on the optical identifier as a challenge,a detector (15) for detecting as response a speckle pattern (16) produced by the optical identifier upon being challenged with the light beam,a reading unit (18) for reading the authentication information, anda verification unit (19) for comparing the response with the authentication information, the authentication information being related to the response.
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Accused Products
Abstract
The invention relates to a system comprising an information carrier 11 having an optical identifier 12, and an apparatus 10, wherein the apparatus prior to accessing the information carrier verifies if the optical behavior of the optical identifier is consistent with authentication information 17 present in the information carrier. The authentication is performed by challenging the optical identifier with a least one light beam 14, detecting a resulting speckle pattern 16 on a detector 15 as a corresponding response, and comparing it with the authentication information 17. Access to the information carrier can be made conditional to a successful authentication, in particular by encrypting user-information 20 present in the information carrier, and thereby providing a strong copy protection scheme. The invention can be applied for example to optical disks or smart cards. The invention further relates to the information carrier, the apparatus, a method for the authentication and a computer program.
37 Citations
13 Claims
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1. A system comprising an information carrier (11) for comprising user-information (20) and an apparatus (10) for accessing the information carrier, the information carrier comprising an optical identifier (12) representing a physical one-way function and authentication information (17), the apparatus comprising:
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a light source (13) for challenging the optical identifier, when the information carrier is present in the apparatus, by generating a light beam (14) incident on the optical identifier as a challenge, a detector (15) for detecting as response a speckle pattern (16) produced by the optical identifier upon being challenged with the light beam, a reading unit (18) for reading the authentication information, and a verification unit (19) for comparing the response with the authentication information, the authentication information being related to the response. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. An information carrier (11) for comprising user-information (20), the information carrier comprising an optical identifier (12) representing a physical one-way function which is able to produce a speckle pattern (16) as a response upon being challenged with a light beam (14) as a challenge, and further comprising authentication information (17) related to the response.
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11. An apparatus (10) for accessing an information carrier (11) for comprising user-information (20), which information carrier comprises an optical identifier (12) representing a physical one-way function and authentication information (17), comprising:
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a light source (13) for challenging the optical identifier with a light beam (14) as a challenge, a detector (15) for detecting a speckle pattern (16) produced by the optical identifier as a response upon being challenged with the light beam, a reading unit (18) for reading the authentication information, and a verification unit (19) for comparing the response with the authentication information, the authentication information being related to the response.
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12. A method for accessing an information carrier (11) for comprising user-information, which information carrier comprises an optical identifier (12) representing a physical one-way function and authentication information (17), comprising:
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a challenging step (42), for challenging the optical identifier with a light beam (14) as a challenge, a detecting step (43), for detecting a speckle pattern (16) produced by the optical identifier as a response upon being challenged with the light beam, a reading step (41), for reading the authentication information, and a verification step (44), for comparing the response and the authentication information, the authentication information being related to the response. - View Dependent Claims (13)
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Specification