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Chase提出multi-authority attribute based encryption方案的安全性完全受限于Center Authority(CA)的可信性,为解除该限制,本文提出基于密文策略多机构属性基加密方案,通过结合密文策略思想去除了CA.通过引入树形访问策略及Shamir秘钥安全共享技术,实现了共享信息细粒度灵活访问控制并支持系统属性的有效撤销.安全性分析表明了本方案在标准模型下是适应性选择明文安全(CPA)的.
Chase proposed that the security of multi-authority attribute based encryption is completely limited by the credibility of Center Authority (CA). To solve this limitation, this paper proposes a multi-agent attribute-based encryption scheme based on ciphertext strategy. Removed the CA. By introducing tree-based access strategy and Shamir key sharing technology, this paper realized fine granularity flexible access control of shared information and supported the effective revocation of system attributes.Security analysis shows that this scheme is an adaptive choice under the standard model Clear text safe (CPA).