Research On Secure Communication Of The Internet Of Things Based On Blockchain And Signal Protocol

With the rapid development of the Io T in various domains of society,social life has gradually stepped into a new intelligent era of interconnection of all things.However,as many Io T devices are applied in an open and shared interconnected environment,their secure communication and identity authentication have gradually become the bottleneck restricting the development of the Io T.Therefore,guaranteeing the security and credibility in the communication process has become the issue of the first importance in the study on the security of the Io T.For the threats faced by data transmission in the Io T environment,it is possible to apply identity authentication and session key agreement protocols to protect the communication security among Io T devices.But most identity authentication and key agreement protocols are not applicable to the actual Io T environment due to their high computational complexity and high operation cost.Based on Signal protocol and chaotic mapping,this paper proposes a secure communication technology suitable for the Io T environment,and realizes the rapid authentication of the device's trusted identity using blockchain technology,for the possible problems such as single point of failure and malicious attacks.The main work is as follows:(1)Aiming at the imbalance between the communication security and computing efficiency of identity authentication and key agreement protocols in the Io T environment,this paper proposes an identity authentication and key agreement technology based on Signal protocol and chaotic mapping.It is an improvement based on the Double Ratchet algorithm of Signal protocol and the extended Chebyshev polynomials in chaotic mapping,achieving the forward and backward security of data in the communication process in the Io T environment,and improving the operation efficiency.(2)Aiming at the problems like single point of failure and DDo S attacks in the communication environment,this paper,based on the distributed and tampering-proof characteristics of blockchain,further proposes the decentralized management and distributed authentication technology of identity information for the Io T devices before the communication,which improves the security and efficiency of identity authentication.(3)Combined with the above work,this paper designs and implements a secure communication system based on the actual Io T environment,which guarantees the authenticity of the Io T device's identity and the security of communication data.