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中文摘要：
对于公钥密码体制来说,私钥泄漏是一种十分严重的威胁.传统密码系统可以通过撤销公钥来应对私钥泄漏,但在属性基密码系统里,公钥由属性集合表示,对这些属性集合的撤销不太可行.目前,密钥隔离机制是减轻密钥泄漏所带来危害的一种有效方法.为了处理属性基密码系统中的密钥泄露问题,将并行密钥隔离机制引入到密文策略的属性基加密中,提出了密文策略的属性基并行密钥隔离加密（ciphertext policy attribute-based parallel keyinsulated encryption,简称CPABPKIE）的概念.在给出CPABPKIE的形式化定义和安全模型的基础上,构建了一个不需要随机预言机模型的选择ID安全的CPABPKIE方案.所提方案允许较频繁的临时私钥更新,同时可以使协助器密钥泄漏的几率保持较低,因此增强了系统防御密钥泄漏的能力.
英文摘要：
The key-exposure problem has perhaps been the most devastating attack on a cryptosystem.Conventional public key cryptosystems can revoke public keys in the case of key-exposure.However,the public key for an attribute-based scheme represents an attribute set should not be changed.Key-Insulation is a crucial technique for protecting private keys.To deal with the key-exposure problems in an attribute-based cryptosystem,this paper extends the parallel key-insulated mechanism to ciphertext policy attribute-based encryption scenarios and introduces the primitive of ciphertext policy attribute-based parallel key-insulated encryption（CPABPKIE）.After formalizing the definition and security notions for CPABPKIE,a concrete CPABPKIE scheme is presented.The security the proposed CPABPKIE scheme can be proved in the selective-ID model.The new primitive does not increase the risk of helper key-exposure,and allows frequent key updating.
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