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:
Apr. 13, 2010
Filed:
Jun. 02, 2004
David Arditti Modiano, Clamart, FR;
Oliver Billet, Tourrettes/Loup, FR;
Henri Gilbert, Bures sur Yvette, FR;
David Arditti Modiano, Clamart, FR;
Oliver Billet, Tourrettes/Loup, FR;
Henri Gilbert, Bures sur Yvette, FR;
France Telecom, Paris, FR;
Abstract
A traceable method for encrypting and/or decrypting data broadcast by at least one transmitter towards several decoders includes the steps: during encryption of broadcast data, the transmitter implements (in) at least one first secret function to transform an unencrypted message into an encrypted message; and during decryption of the broadcast data, all the decoders implement (in) at least one common second secret function, each decoder using therefor a mathematical description of the second function stored in a memory (), the mathematical description of the second function being different from one decoder to another or from one group of decoders to another such that the mathematical description used identifies exclusively the particular decoder or group of decoders.