基于区块链的云数据匿名确定性删除方法

现有确定性删除方案忽略了用户数据与用户身份的关联性,使用户的删除行为暴露给攻击者或云服务提供商。为解决此问题,提出一种基于区块链的云数据匿名确定性删除方法。该方法改进了可链接环签名方案,使用户可以通过控制签名中的链接标记在匿名情况下实现确定性删除;同时,它利用区块链记录删除行为,使其具有不可抵赖性。理论分析和实验表明:该方法不仅能满足用户数据的确定性删除要求,而且具有匿名性可以切断用户数据与其身份的关联,从而有效避免攻击者或云服务提供商对用户行为的追踪分析。

Cloud data anonymous assured deletion approach based on blockchain

The previous assured deletion schemes ignored that the privacy is threated by the relevance between data and user identity,exposing user behavior to the cloud service provider or attackers.Aiming at the above problems,an assured deletion approach based on blockchain was proposed.The improved linkable ring signature scheme was adopted to make user achieve anonymous assured deletion by setting specific link symbol in the signature.Moreover,the blockchain technology was leveraged to guarantee the nonrepudiation of assured deletion.Theoretical analysis and experimental results show that the proposed approach can meet the assured deletion requirements of user data in cloud storage,and its anonymity can effectively prevent attackers from tracking and analyzing user behavior.