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:
Oct. 15, 2024
Filed:
Nov. 11, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Ryo Nishimaki, Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
A digital watermark system that realizes digital watermark for a cryptographic function, including a memory and a processor configured to take as input a security parameter and generate a watermark embedding key for embedding information representative of a watermark in a circuit that realizes the cryptographic function, and a watermark extraction key for extracting information representative of the watermark from a circuit in which a watermark is embedded; take as input a master private key used for the cryptographic function, the watermark embedding key, and information representative of a watermark, and generate a circuit in which the watermark is embedded and that realizes the cryptographic function; and take as input the watermark extraction key and the circuit in which the watermark has been embedded, and extract information representative of a watermark from the circuit.