任务匹配中抗密钥泄露可撤销属性加密方案

Revocable attribute encryption scheme to prevent keydisclosure in task matching

针对现有属性加密方案难以防止群智感知系统任务匹配密钥泄露和实现用户细粒度撤销问题,提出一个结合默克尔帕特丽夏树和增量哈希的抗密钥泄露可撤销属性加密方案。将单一属性机构分为多个解决系统性能瓶颈问题,利用默克尔帕特丽夏树存储用户身份和私钥信息防止密钥泄露发生,采用增量哈希对更新后的用户信息进行快速修改实现用户撤销和属性撤销。实验结果表明,该方案具有更低的时间开销,能够抵抗共谋攻击,保证前向安全和后向安全。

To solve the problem that the existing attribute encryption schemes are difficult to prevent the leakage of task matching keys and achieve fine-grained revocation of users,an anti-key disclosure revocable attribute encryption scheme based on Merkel Patricia tree and incremental hash was proposed.The single attribute organization was divided into several to solve the bottleneck of system performance,and the Merkel Patricia tree was used to store user identity and private key information to prevent key leakage.Incremental hash was used to quickly modify the updated user information to achieve user revocation and attribute revoca-tion.Experimental results show that the scheme has lower time overhead,can resist collusion attacks,and ensures forward security and backward security.