Research On Access Control In Wireless Sensor Networks

The security problem has always been the bottleneck of wireless sensor networks towards practicality and scale.To ensure the security of monitoring data is the first consideration,especially sensitive monitoring data,so it is necessary to strictly manage and control the access behavior of users.Due to the distributed and resource limited characteristics of wireless sensor networks,many mature traditional access control mechanisms are not suitable.The traditional access control mechanism based on unique identity is easy to cause the privacy disclosure of users' access.Attackers can obtain users' privacy preferences and behavior patterns by collecting and analyzing users' access requests,etc.to threaten the privacy security of visitors.In addition,at present,many wireless sensor networks provide more friendly sharing platform for users by forming alliance environment through cooperation.How to achieve secure cross domain access has become a security challenge under the alliance environment.Based on the research of access control mechanism and emerging security technology of wireless sensor networks at home and abroad,the following work is carried out in this paper:(1)A new privacy protection access control model for wireless sensor networks is designed.This paper implements anonymous authentication based on group signature technology,and improves the traditional group signature,solves the problem that the traditional scheme needs to rely on a fully trusted third party,and realizes the accountability of user authentication request to all entities in the network supporting the scheme anonymously at the same time.Combining the improved group signature with hidra access control protocol,an access control model supporting privacy security is designed.After implementation and verification,the feasibility and validity of the model are proved.(2)The privacy protection access control model in single domain environment is extended to coalition environment,and a cross domain access control model supporting privacy security is designed.In view of the security of cross domain ticket interaction in the alliance environment,this paper proposes a cross domain ticket push mechanism based on blockchain technology.Each application domain establishes decentralized trust relationship through the alliance chain network,and broadcasts cross domain tickets through the global ledger.This mechanism ensures that cross domain tickets can not be forged and tampered,and also avoids the frequent interaction process in cross domain.Through the implementation and verification of the cross domain smart contract,the feasibility of the cross domain scheme is proved.(3)Design and implement access control model supporting privacy protection.Through the verification and time performance test of each stage of the improved group signature,it is proved that the improvement of this paper is correct and effective,and the time performance is more optimized than the similar schemes.The function of access control protocol is verified,and the energy consumption and time cost introduced by the protocol in the sensor are evaluated and compared.It is proved that the model is lightweight and can adapt to the resource constrained environment at the sensor end.Design the intelligent contract of cross domain authentication under the environment of alliance,and code and test it.This scheme makes up for the lack of privacy security and cross domain authentication in the existing access control,provides a reference for the research of wireless sensor network security.