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:
Aug. 27, 2013
Filed:
Jun. 10, 2003
Olivier Brique, Le Mont-sur-Lausanne, CH;
Christophe Nicolas, Préverenges, CH;
Marco Sasselli, Chardonne, CH;
Olivier Brique, Le Mont-sur-Lausanne, CH;
Christophe Nicolas, Préverenges, CH;
Marco Sasselli, Chardonne, CH;
Nagravision S.A., Cheseaux-sur-Lausanne, CH;
Abstract
This invention concerns a safe data exchange method between two devices locally connected to one another. In a preferred embodiment, the first device () is a security module containing a first encrypting key, said private key (PAKV) of a pair of asymmetric encrypting keys. The second device is a receiver () comprising at least one second encrypting key, said public key (PAKB) of said pair of asymmetric encrypting keys. Furthermore each of the devices comprises a symmetrical key (). The first device () generates a first random number (A), which is encrypted by said private key (PAKV), then transmitted to the second device (), in which it is decrypted by means of the public key (PAKB). The second device () generates a second random number (B), which is encrypted by said public key (PAKB), then transmitted to the first device (), in which it is decrypted by means of the private key (PAKV). A session key (SK), used for safe data exchange, is generated by a combination of the symmetric key () and the random numbers (A, B) generated and received by each of the devices.