Research On Secure Data Aggregation Method Of Vehicle Network Based On Homomorphic Encryption

In the data aggregation of VANETs,the data fusion of multiple vehicle nodes can effectively reduce the load of network transmission and improve the efficiency of various data services in VANETs.However,with the aggregation of vehicle privacy data,the privacy information of each vehicle node will be leaked.On the other hand,in the process of data aggregation,false or invalid data will have a serious impact on the aggregation process,even destroy the rules of road traffic operation,resulting in malignant traffic accidents.Based on fully homomorphic encryption,this paper studies the secure aggregation process of data in VANETs.The specified contents are shown below:(1)Using NTRU encryption algorithm and RLWE difficulty assumption,a homomorphic batch authentication mechanism is designed.Using the homomorphic nature of variant NTRU scheme and its multiplication and addition homomorphism,certificates signed by different keys are fused and authenticated.This scheme is different from the traditional batch authentication based on ECC.Its security can be reduced to the difficulty of lattice.At the same time,because of the advantages of NTRU in computing performance,it can also ensure its computational efficiency.(2)A homomorphic data aggregation mechanism based on MFHE is designed.On the basis of GSW scheme,in order to ensure secure decryption in multi-key fully homomorphic encryption,Mukherjee P and Wichs D proposed a two-rounds MPC protocol.In the basic theory of the protocol,the homomorphic partial decryption mechanism was proposed.In order to realize the homomorphic aggregation computation of dynamic topology in VANET,we improved it by introducing a linear secret sharing mechanism,and shared the private key of each node involved in the computation.At the same time,in order to ensure the security of its computation,we fused it with part of the decryption mechanism and added noise confusion.(3)A secure data aggregation protocol in VANETs is designed.Based on the above signature mechanism and partial decryption mechanism,this paper redesigns the VANET secure data aggregation protocol.The protocol is divided into two stages: verification stage and aggregation stage.In the verification stage,in order to ensure the reliability of the data,the received information is verified by a single or batch method;in the aggregation stage,the received data is homomorphically calculated to get aggregated results.The innovation of this paper can be described as follows:(1)A signature algorithm with batch authentication is designed based on NTRU encryption algorithm and RLWE difficulty assumption.(2)On the basis of GSW scheme,a linear secret sharing mechanism is introduced to share the private key of each node involved in the computation,and a variant partial decryption scheme is realized.(3)Homomorphic signature mechanism and variant with batch authentication are implemented.On the basis of partial decryption mechanism,a new VANETs secure data aggregation protocol is redesigned.