Research On Data Protection Based On Group Communication

In recent years,with the rapid development of Internet and computer technology,various communication tools are emerging and communication modes are becoming more and more diverse.With the development of communication tools,data security has been paid more and more attention,and the protection of data in group communication has become one of the most important research directions.The group key agreement protocol and access control are the main technologies for protecting group data,and are also the current research hotspots and difficulties,this article will study the two aspects of group data protection.DiffieHellman key exchange protocol is regarded as the basic axiom of key agreement.With the deepening of research in the field of information security protection,the Diffie-Hellman key exchange protocol shows some shortcomings,but it is still the foundation of the research of the current group key agreement protocol.In this paper,the research of group key agreement is carried out on the basis of Diffie-Hellman key exchange protocol.A group key agreement protocol based on the structure of ternary tree is proposed based on the bilinear difficulty problem,which improves the efficiency of the protocol execution in the stage of establishment and update of group keys.In the aspect of group data security,in view of the current traditional access control model is not suitable for dynamic Group,on the basis of role-based access control model,a Group-based access control model(Group-based RBAC,GB-RBAC)is proposed.In this access control scheme,access control problem in dynamic group is solved by adding spatiotemporal and collaborative access attributes.In the end,group key agreement protocol and group access control scheme are combined to propose a group communication data protection scheme,which lays particular emphasis on protecting the data security in the group,preventing illegal users from accessing and legitimate users from unauthorized access.The following research contents are as follows:Communication modes and security requirements of group communication under complex network communication scenarios are analyzed.It mainly includes the security requirements of group session key in group key agreement protocol and the access control problem of group data resource operation in group communication.In view of the establishment of group agreement protocol and the efficiency of updating protocol,we improve it based on the existing group key agreement protocol.In this paper,a new ternary tree group key agreement protocol is proposed based on the organizational structure and identity authentication among members.And the performance and security of the new group key agreement protocol are described in detail.In terms of group access control,the characteristics and requirements of dynamic group access control are analyzed.Based on the role based access control model,the dynamic changes of members in the group are improved on the basis of role based access control model.The features of spatiotemporal attributes,access threshold and cooperative group access are added to achieve fine grained access to group members and ensure the security of group data resources.Combined with ternary tree group key agreement protocol and group access control scheme,a data protection scheme for group communication is proposed.The process of group members from group key agreement to data access is described in detail.The combination of group key agreement protocol and group access control makes the data protection scheme in key agreement and data protection efficiency,and the scalability of the scheme is greatly improved.