一种改进的属性加密方案

摘要

属性加密适合一对多的广播加密环境,很好地保护了用户的隐私,而且容易实现细粒度的访问控制.然而已有的属性加密方案中安全性假设过强、运算效率较低.通过对Waters方案的安全性假设进行分析,提出了随机参数满足一定特定关系的Eq-BDHE假设.基于该假设实现了一种改进的CP-ABE加密方案.安全分析和对比实验表明,改进方案降低了安全假设强度,在标准模型下能够抵抗选择明文攻击,同时减少了随机参数的数量,提高了运算效率.%Attribute-based encryption is suitable for one-to-many broadcast encryption environment,and is easy to implement fine-grained access control,protecting the user's privacy well.This paper summarized the development present situation of the attribute-based encryption.Through the analysis of the security assumption of Waters scheme,Eq-BD-HE was presented with its the random parameters satisfying certain specific relation.The improved CP-ABE encryption scheme was implemented.The security analysis and comparative experiments show that the new scheme has better security,reduces the number of system parameters,and improves the efficiency of encryption and decryption operations.