基于区块链的安全车联网数字取证系统

Secure vehicular digital forensics system based on blockchain

车联网大数据的出现对更好地理解车联网特点、掌握车联网用户需求和提升车联网服务质量具有极大的推动作用,然而恶意用户甚至不法分子利用车联网进行非法行为,造成车联网服务质量下降以及车联网事故难以定责。同时,在车联网数字取证过程中,还存在一些安全和隐私问题,如数据提供者的身份隐私和数据访问者的请求权限问题。因此,提出了一种基于区块链的安全车联网数字取证方案。首先数据请求者在一个证书中心注册后获得匿名证书,用于后续的数据上传。然后数据访问者注册后获得公私钥对和用户密钥,分别用于数据请求和数据解密,只有其属性满足特定要求才能解密得到正确证据。接下来可信度较高的若干个机构联合建立一个区块链,记录车联网取证过程中所有的数据上传交易和数据访问交易。最后,对方案的安全和隐私进行分析,并在以太坊平台上对其性能进行实验分析。

The emergence of vehicular big data has brought a great promotion to better understand characteristics of vehicular networks,grasp needs of users and improve service qualities.However,malicious users and criminals leverage vehicular networks to conduct illegal behaviors,resulting in a decline in the service quality and difficulties in determining the liability in vehicle accidents.At the same time,there are still some security and privacy issues in the vehicular digital forensics,such as the identity privacy of the data provider and the request control of the data requester.Therefore,a secure vehicular digital forensics scheme based on blockchain was proposed.Firstly,a data requester registered with a certificate authority and an anonymous certificate was obtained for the subsequent data uploading.Then,the data user obtained the public-private key pair and user key in registration,which were respectively used for the data requesting and data decryption.Only if certain attributes were held,the right plaintext could be decrypted.Next,a consortium blockchain was jointly established by several institutions with high credibility to record all data transactions.Finally,the security and privacy were experimentally analyzed,and the performance was tested based on the Ethereum platform.