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THE DESIGN OF A TREE-BASED SCALABLE DISTRIBUTED GROUP KEY MANAGEMENT

 

TITLE THE DESIGN OF A TREE-BASED SCALABLE DISTRIBUTED GROUP KEY MANAGEMENT
AUTHOR WISUT PIEWKHAM
DEGREE MASTER OF SCIENCE PROGRAMME IN COMPUTER SCIENCE
FACULTY FACULTY OF SCIENCE
ADVISOR SUDSANGUAN NGAMSURIYAROJ
CO-ADVISOR VASAKA VISOOTTIVISETH
 
ABSTRACT
Group communication has presently become a common and effective way to connect people together for sharing information and requires secure communication within designated members of the group. Therefore, providing security is mandatory in such a way that messages sent among members are encrypted with a shared group key and other non-members cannot see any communicating messages. When a member leaves or joins the group, the group key needs to be changed (rekeyed) to prevent forward and backward secrecy. In other words, new joining members cannot listen to past conversations and old leaving members cannot listen to future conversations of the group. Several group key management protocols [8, 16 and 22] have recently been proposed. Most protocols contain characteristics or assumptions that would be impractical. They include: having a central key server for distributing keys to members and thus allowing a single point of failure; keys sent via insecure channel; members storing a high number of keys and thus increasing the risks of compromising security; and low scalability when adding members. This thesis proposes a Tree-Based Scalable Distributed Group Key Management system based on two principal ideas: dividing a group into subgroups, and having a secure group key agreement using the Diffie-Hellman Algorithm. The proposed model was simulated using ns-2 network simulation tool. The experimental results show that generating a group key in this model takes rather long since every member participates in the process. However, overall, this model provides a secure and scalable group key management system. In addition, the number of keys stored by members does not vary with increasing numbers of members.
KEYWORD GROUP KEY MANAGEMENT / KEY AGREEMENT / DIFFIEHELLMAN ALGORITHM / REKEYING

 

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