Research On The Key Technology Of Asymmetric Group Key Agreement

Group key negotiation is one of the key technologies in the field of information security,and it is also a challenging subject in the field of information security research.The project has great scientific value,not only related to national security strategy,but also widely used in national defense,business,medicine,and education et al.,such as the air collaborative operations need self-organized security communications among the unmanned aerial vehicles in confidential information collection,and reconnaissance in wireless network,the information resources security sharing technology in cloud security storage,multi-security computing and security collaboration,remote secret video conference,remote privacy protection medical technology et al.Group key negotiation technology can build a secure group communication channel for these applications to ensure the confidentiality,security,and reliability of group communication.The research of traditional group key negotiation still stays in a single security domain,fixed one-size-fits-all group key negotiation mode.These technologies are not suitable for the application of large-scale,distributed,and new network environment.Such as mobile clouds have the characteristics of resource distribution in multi-domain,information confidentiality diversification and the resource-constrained of terminals.In this environment,the group key agreement needs to solve the problem of cross-domain,multi-level three-dimensional information exchange and asymmetric calculation.Aiming at the application requirements of the new network,this thesis intends to design an orientable cross-domain asymmetric group key agreement protocol to solve the complex information exchange problem in this environment.The main contributions are presented as follows:1)In the the large-scale,cross dissolve,isomerization development of new network,many collaborative computing,multi-party computing,resource sharing,and so on are not limited to the same security domain.The group key agreement within a single security domain is not suitable for the multi-domain complex network and the multi-domain heterogeneous network environment.Aiming at these information security exchange and secure transmission of terminal groups distributed in different security domains,A multi-domain asymmetric group key agreement(Md-AGKA)is proposed.It adopts Bilinear Mapping Technology and double-blind signature technology to blind the group public key factor and group private key factor of terminals distributed in different security domains.The other members of the group mutual authentication use the bilinear mapping when they received blind key factors,and then achieve a verifiable group key agreement.Combined the certified group public key factors with the group private key factors of group members to calculate the mapping function of the group public / private key pair,and the asymmetric group communication encryption system is realized.It is analyzed and proven that the proposed multi-domain group key agreement has high security and centain anonymity.Meanwhile,compared to the current research,the results in energy consumption has a certain advantage.2)This thesis proposes the extraction algorithm,distribution algorithm and combination technology for group key factors,so that the security information of different security levels can be exchanged directly and transmitted safely among the subset members with corresponding rights.The group key agreement protocol can realize multi-level,three-dimensional information security exchange.It has more flexibility and practicality,and is suitable for the information exchange and transmission among groups under the new complex network environment.3)In the wireless sensor networks or mobile Internet,sensor nodes or mobile terminals are mostly small mobile devices.These networks have some obvious characteristics,such as communication range is limited,energy-constraint,network is vulnerable et al.Group key agreement in this environment requires a cross-cluster,computation and communication overhead are light weight and highly safe group key agreement protocol.In order to address these issue,the paper proposes a cross-domain lightweight asymmetric group key agreement.To establish a safe and efficient group communication channel among sensor nodes.Firstly,the protocol establishes the secret information among the cluster heads,the cluster head as the bridge node to realize the sensor nodes in different cluster have the same group key information,thus realizing the cross cluster asymmetric group key agreement.The whole network node can share the secret information with the internal group nodes,which realizes the group security communication mechanism of the message sender unconstraint,proposed an asymmetric calculation to achieve computation and communication migration technologies to ensure that the sensor nodes are lightweight computing and communication consumption.For our asymmetric GKA protocol,the key confirmation is simple and requires no additional rounds if the protocol has been propertly executed.It is proven that the proposed protocol has the advantages in security and energy consumption.