An Attribute-Based Encryption Scheme Based on Unrecognizable Trapdoors  

作　　者：Ruizhong Du Ailun Tan Junfeng Tian 

机构地区：[1]the Cyberspace Security and Computer College,Hebei University,Baoding 071002,China [2]Key Laboratory on High Trusted Information System in Hebei Province,Baoding 071002,China

出　　处：《Tsinghua Science and Technology》2020年第5期579-588,共10页清华大学学报（自然科学版（英文版）

摘　　要：Attribute-Based Encryption (ABE) has been widely used for ciphertext retrieval in the cloud environment.However,bi-flexible attribute control and privacy keywords are difficult problems that have yet to be solved.In this paper,we introduce the denial of access policy and the mutual matching algorithm of a dataset used to realize bidirectional control of attributes in the cloud server.To solve the problem of keyword privacy,we construct a security trapdoor by adding random numbers that effectively resist keyword guessing attacks from cloud servers and external attackers.System security is reduced to the Deterministic Bilinear Diffie-Hellman (DBDH) hypothesis problem.We validate our scheme through theoretical security analysis and experimental verification.Experiments are conducted on a real dataset,and results show that the scheme has higher security and retrieval efficiency than previous methods.Attribute-Based Encryption (ABE) has been widely used for ciphertext retrieval in the cloud environment.However,bi-flexible attribute control and privacy keywords are difficult problems that have yet to be solved.In this paper,we introduce the denial of access policy and the mutual matching algorithm of a dataset used to realize bidirectional control of attributes in the cloud server.To solve the problem of keyword privacy,we construct a security trapdoor by adding random numbers that effectively resist keyword guessing attacks from cloud servers and external attackers.System security is reduced to the Deterministic Bilinear Diffie-Hellman (DBDH) hypothesis problem.We validate our scheme through theoretical security analysis and experimental verification.Experiments are conducted on a real dataset,and results show that the scheme has higher security and retrieval efficiency than previous methods.

关 键 词：Attribute-Based Encryption(ABE) unrecognizable trapdoor two-way access strategy ciphertext search 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]