Aiming at the privacy protection of participant's truth data in mobile crowdsensing,we proposed an efficient and verifiable security truth discovery method,named EVSTD.By the security iterations,the participant's weight value and the truth of the evaluated object are updated,so we can obtain the truth of the object.In EVSTD,participants use local seed to generate a local random number,and negotiate seed with associated neighbors to generate a negotiated random number by the key agreement protocol.Participants use local random number and negotiated random number to disturb sensitive data with double masks,which can not only ensure the privacy of sensitive data,but also solve the problem of sensitive data leakage caused by delayed sending of perceived data by participants.At the same time,EVSTD uses secret sharing protocol to solve the problem of disconnection or invalidation of participants,and the strategy of select L-neighbor node dynamically to let participants only communicate with their associated neighbors,thus greatly reducing the computa-tional and communication costs of participants.At the same time,when the participant generates disturbed data,it calcu-lates the homomorphic hash of sensitive data and the data used for verification and uploads them to the server.The server calculates the aggregation result and its proof according to the sensitive data and verification information,and finally sends them to participants.The participant verifies the aggregation results and proof data sent by the server according to the ex-isting verification information.If the verification passed,the aggregation result will be correct,which further guarantees the credibility of the truth discovery results,so as to solve the problem that the cloud server may tamper with the partici-pant's sensitive data,and ensure the reality of the aggregation results in mobile crowdsensing perception.The experimental results show that the proposed method can identify the true and reliable data information while protecting data privacy,and can prevent servers from tampering with data and conspiracy attacks.
关键词
移动群智感知/真值发现/数据隐私/验证/双掩码
Key words
mobile crowd sensing/truth discovery/data privacy/verification/double mask
维普
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