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:
Jun. 08, 2004
Filed:
Sep. 14, 1999
Applicant:
Inventors:
Min-Jea Gau, Taipei, TW;
Yen-Sha Chen, Tainan, TW;
Wen Tsuei, Keelung, TW;
Wen-Hsin Yang, Hsinchu, TW;
Jen-Chieh Cheng, Changhua, TW;
Assignee:
Industrial Technology Research Institute, Hsinchu, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L 9/00 ; G06F 1/130 ;
U.S. Cl.
CPC ...
H04L 9/00 ; G06F 1/130 ;
Abstract
A data access control system and a method thereof is disclosed. First, the master key is divided into n subkeys to be kept by n holders, by way of secret sharing. The master key reconstruction procedure utilizes the shared secret with the subkey holders to obtain m subkeys (1<m<n) and then reconstructs the master key, using the (m,n)-threshold scheme. The system then uses the master key to access the data. Thus, m subkeys are required to reconstruct the master key in order to amend or read the data in the system.