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:
Dec. 01, 2009
Filed:
Jan. 19, 2005
Hiroshi Fujimoto, Yokohama, JP;
Takashi Suzuki, Yokosuka, JP;
Takehiro Nakayama, Yokohama, JP;
Atsushi Takeshita, Yokohama, JP;
Hiroshi Fujimoto, Yokohama, JP;
Takashi Suzuki, Yokosuka, JP;
Takehiro Nakayama, Yokohama, JP;
Atsushi Takeshita, Yokohama, JP;
NTT DoCoMo, Inc., Tokyo, JP;
Abstract
A multi signature verification system adds new additional data to original data with a signature attached thereto and verifies validity of the original data and the additional data. The system includes an electronic signature attaching apparatus including an electronic signature attaching unit attaching an electronic signature to original data previously created, acquired trapdoor hash value, and identification information, a data addition apparatus, and an electronic signature verification apparatus.