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. 28, 2026
Filed:
Jun. 02, 2020
Applicant:
Nec Corporation, Tokyo, JP;
Inventors:
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L 9/32 (2006.01); H04L 9/08 (2006.01);
U.S. Cl.
CPC ...
H04L 9/3247 (2013.01); H04L 9/0825 (2013.01); H04L 9/3236 (2013.01);
Abstract
A signature verification systemincludes a signature apparatusconfigured to sign data including a predetermined data block replaced with a chameleon hash value, using one or more public keys for changers authorized to change data, a changing apparatusconfigured to receive the signed data, and to change a content of the predetermined data block of the signed data using a private key associated with any of the one or more public keys, and a verifying apparatusconfigured to receive the signed data with the changed content of the predetermined data block, and to verify the signature using the one or more public keys for the changers.