Title:
GROUP KEY MANAGEMENT METHOD BASED ON N-DIMENSIONAL SPHERE
Document Type and Number:
WIPO Patent Application WO/2010/094183
Kind Code:
A1
Abstract:
A group key management method based on an n-dimensional sphere is provided. After initialization, when new users join, the group manager accepts and numbers the new users; when users leave, the group manager deletes the confidential information of the leaving users. If there are users joining and leaving at the same time, the group manager deletes the confidential information of the leaving users, accepts the new users joining, numbers the new users and accepts the confidential information of the new users. The group manager then selects the mapping parameters, and maps the confidential information of each user in the group and of itself to their respective points in space; the sphere center composed by these points is computed, the center and the mapping parameters are published, and the numbers of any leaving users are published. The users in the group compute the corresponding points in space according to their own numbers, and then determine the group key. The present invention can efficiently decrease stored user information, the amount of calculations and messages when the key is updated, and keep the keys independent of each other.
Inventors:
YANG ZHIMIN (CN)
TANG SHAOHUA (CN)
LU BORONG (CN)
TANG SHAOHUA (CN)
LU BORONG (CN)
Application Number:
PCT/CN2009/071094
Publication Date:
August 26, 2010
Filing Date:
March 31, 2009
Export Citation:
Assignee:
UNIV SOUTH CHINA TECH (CN)
YANG ZHIMIN (CN)
TANG SHAOHUA (CN)
LU BORONG (CN)
YANG ZHIMIN (CN)
TANG SHAOHUA (CN)
LU BORONG (CN)
International Classes:
H04L9/00
Foreign References:
| CN101291214A | 2008-10-22 | |||
| US7333611B1 | 2008-02-19 | |||
| EP1482704A2 | 2004-12-01 |
Other References:
CHENSHAO JUN ET AL.: "Method for multicast key updating based on hypersphere", JOURNAL OF ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE, vol. 22, no. 3, September 2007 (2007-09-01), pages 48 - 50
Attorney, Agent or Firm:
GUANGZHOU HUAXUE INTELLECTUAL PROPERTY AGENCY CO., LTD (No.1 Building Technology Park of South China University of Technology,Wushan, Tianhe Distric, Guangzhou Guangdong 0, CN)
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