Research On Efficient Tree-based Group Key Agreement Protocol With Administrator

With the rapid development of computer and communication technologies,people have more and more demands for group communication related to Internet applications.Due to the openness of the Internet,criminals may eavesdrop,tamper,and forge information transmitted in open channels.Therefore,we need to establish a reliable secure channel between communicating entities.The group key agreement technology with management nodes is one of the commonly used technologies for establishing secure channels,and is widely used in practical applications.Among them,the tree-shaped key agreement protocol with management nodes has attracted the attention and research of many scholars at home and abroad.The main idea of this type of protocol is that the management node uses a tree-like logical structure to organize the relationship between users in the group,and completes the negotiation of the session key according to the structure of the key tree.Since this type of protocol uses a key tree,its storage overhead increases.In addition,the key tree will also increase the number of communication rounds of the protocol and bring about the dynamic change of the administrator’s identity when the protocol is running.Aiming at the above problems,this paper proposes an efficient tree-shaped group key agreement protocol with management nodes.The main work of this paper includes the following aspects:1.Aiming at the problem of too many communication rounds in the existing tree-shaped group key agreement protocol,an efficient and secure tree-shaped group key agreement protocol with management nodes is proposed,including:· Under the management of the administrator,a group is supported to conduct group key negotiation interactively,and realize the dynamic joining and exit-ing of members.· The protocol fixes the identity of the administrator,which solves the problems of the large number of communication rounds brought by the key tree and the dynamic change of the administrator’s identity during the execution of the protocol.· Protocol is a secure protocol that satisfies forward security,post-compromise security,and authentication.· After comparing and analyzing with other protocols in the academic commu-nity,it was found that the protocol has a lower time to perform group change operations,which better meets the dynamic requirements of group key nego-tiation.2.Aiming at the problem that existing group key agreement protocols rely too much on administrators,an efficient and secure tree-shaped group key agreement proto-col with management nodes is proposed,including:· Under the management of the administrator,a group is supported to conduct group key negotiation interactively,and realize the dynamic joining and exit-ing of members.· Support group members to verify the group session key to determine whether the administrator has implemented the agreement honestly.· Protocol is a secure protocol that satisfies key control resistance,forward se-curity,post-compromise security,and authentication.· Through simulation experiments,the feasibility and efficiency of the protocol have been proven,and it has practical application value.