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:
Feb. 26, 2013
Filed:
Nov. 20, 2009
Donglin Wang, Beijing, CN;
Ningsheng Liu, Beijing, CN;
Donglin Wang, Beijing, CN;
Ningsheng Liu, Beijing, CN;
Sursen Corp., Beijing, CN;
Abstract
A method provided herein includes the following steps: storing seal data of an electronic seal, a digital certificate, electronic signature program and a private key of a sealer in an external portable apparatus; performing a Hash conversion to a file to be sealed and the seal data of the electronic seal to generate a data digest, wherein the file to be sealed is a layout file; sealing, in the portable apparatus, the data digest using the private key of the sealer and the electronic signature program to generate an electronic signature result; and combining the file to be sealed, the seal data of the electronic seal, the digital certificate and the electronic signature result to generate a seal combination file.