The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 2002
Filed:
Aug. 19, 1997
Wolfgang Buhr, Hamburg, DE;
Helmut Hörner, Hamburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
In order to unambiguously allocate a data carrier to an object, key information is written into the data carrier. Before writing-in the key information, secret identification information and open identification information is written into the data carrier. Copies of the secret and open information are stored in a central station. In the central station, for a particular data carrier, the open and secret information is associated with each other. In addition thereto, in the central station, object information for the particular object, and key information for the object are associated with each other. From the data carrier, the open identification information is sent to the central station to access the associated stored open and secret identification information so as to retrieve the stored secret identification information. In addition thereto, object information is sent to the central station to access the associated stored object and key information so as to retrieve the stored key information. The retrieved key information is encrypted with the retrieved secret identification information and the encrypted key information is sent to the data carrier. In the data carrier, the received encrypted key information is decrypted. The decrypted key information is written into the data carrier.