Secure Key Management for Dynamic Multicast Groups Based on the Pyramid Structure in a Networked Multi-User Virtual Environment

• Main Authors: Li-Wei Hsiao, 蕭立韋
• Other Authors: Chin-Shyurng Fahn
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/93845605998199434745

碩士 === 國立臺灣科技大學 === 資訊工程系 === 91 === Due to the high development of computer networks, it is more and more frequent for everybody to use them. Virtual reality will be the main human-machine interface in the future. Recently, multi-user computer games on line are popular and become a new hot issue among young people, but there are still many technical problems that should be surmounted. Improving rekey strategy in security is one of main technology. If it is applied well, it can save a lot of costs on developing networked systems, and increase the security of virtual reality. To accomplish this, we combine the advantages of pyramid structures and updating secure keys to effectively filter the rekey message delivery that is unnecessary. In this thesis, we propose a hierarchical key management mechanism for secure group communication that supports the integrity and confidentiality of group traffic and is suitable for dynamic groups because the size of a group is frequently varied and any member can join or leave the group at any time. Using a hierarchical concept, we divide the pyramid structure into the administrator (server), group, and member (client) to solve key management problems. For this purpose, we extend the Diffie-Hellman key exchange algorithm to derive the key for each virtual group and assist the server to update keys. As a result, we can decrease the amount of updating messages and the size of messages in the rekey process and reduce computational loading to obtain good system performance. Besides, we adopt the multicast technology based on the pyramid structure that tremendously decreases the network flow of transmitting stations. All the simulation programs are developed with the JAVA software that is independent of platforms and possesses the thread concept. They are easy, effective, and practicable. It is hoped that our proposed methods are greatly useful for the virtual reality and secure group communication domains.