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Efficient multi-authority Attribute-Based Searchable Encryption Scheme with Blockchain Assistance for Cloud-Edge Coordination

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Computers, Materials & Continua 2023年第9期76卷 3325-3343页

作者： Peng Liu Qian He Baokang Zhao Biao Guo Zhongyi Zhai School of Computer and Information Security Guilin University of Electronic TechnologyGuilin541004China School of Computer Science National University of Defense TechnologyChangsha410073China

Cloud storage and edge computing are utilized to address the storage and computational challenges arising from the exponential data growth in IoT.However,data privacy is potentially risky when data is outsourced to cloud servers or edge services.While data encryption ensures data confidentiality,it can impede data sharing and retrieval.Attribute-based searchable encryption(ABSE)is proposed as an effective technique for enhancing data security and privacy.Nevertheless,ABSE has its limitations,such as single attribute authorization failure,privacy leakage during the search process,and high decryption overhead.This paper presents a novel approach called the blockchain-assisted efficientmulti-authority attribute-based searchable encryption scheme(BEM-ABSE)for cloudedge collaboration scenarios to address these issues.BEM-ABSE leverages a consortium blockchain to replace the central authentication center for global public parameter management.It incorporates smart contracts to facilitate reliable and fair ciphertext keyword search and decryption result verification.To minimize the computing burden on resource-constrained devices,BEM-ABSE adopts an online/offline hybrid mechanism during the encryption process and a verifiable edge-assisted decryption mechanism.This ensures both low computation cost and reliable ciphertext.Security analysis conducted under the random oracle model demonstrates that BEM-ABSE is resistant to indistinguishable chosen keyword attacks(IND-CKA)and indistinguishable chosen plaintext attacks(INDCPA).Theoretical analysis and simulation results confirm that BEM-ABSE significantly improves computational efficiency compared to existing solutions.

关键词： Attribute-based encryption search encryption blockchain multi-authority cloud-edge

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Efficient large-universe multi-authority ciphertext-policy attribute-based encryption with white-box traceability

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Science China(Information Sciences) 2018年第3期61卷 16-28页

作者： Kai ZHANG Hui LI Jianfeng MA Ximeng LIU School of Telecommunications Engineering Xidian University School of Cyber Engineering Xidian University School of Computer Science and Technology Xidian University School of Information Systems Singapore Management University

Traceable multi-authority ciphertext-policy attribute-based encryption(CP-ABE) is a practical encryption method that can achieve user traceability and fine-grained access control simultaneously. However, existing traceable multi-authority CP-ABE schemes have two main limitations that prevent them from practical applications. First, these schemes only support small universe: the attributes must be fixed at system setup and the attribute space is restricted to polynomial size. Second, the schemes are either less expressive(the access policy is limited to "AND gates with wildcard") or inefficient(the system is constructed in composite order bilinear groups). To address these limitations, we present a traceable large universe multi-authority CP-ABE scheme, and further prove that it is statically secure in the random oracle model.Compared with existing traceable multi-authority CP-ABE schemes, the proposed scheme has four advantages. First, the attributes are not fixed at setup and the attribute universe is not bounded to polynomial size. Second, the ciphertext polices can be expressed as any monotone access structures. Third, the proposed scheme is constructed in prime order groups, which makes this scheme more efficient than those in composite order bilinear groups. Finally, the proposed scheme requires neither a central authority nor an identity table for tracing.

关键词： attribute-based encryption multi-authority ciphertext-policy traceability large universe

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Black-Box and Public Traceability in multi-authority Attribute Based Encryption

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Chinese Journal of Electronics 2020年第1期29卷 106-113页

作者： ZHAO Qianqian WU Gaofei MA Hua ZHANG Yuqing WANG He School of Cyber Engineering Xidian University School of Mathematics and Statistics Xidian University National Computer Network Intrusion Protection Center University of Chinese Academy of Sciences

Ciphertext-policy Attribute-based encryption(CP-ABE) is a promising tool for implementing finegrained cryptographic access control. While the uniqueness of generating private keys brings extra security issues.The key escrow is inherent in CP-ABE systems because the trusted authority has the power to decrypt every ciphertext. The private keys are only associated with the attributes nor the user’s identity. Some malicious users might be tempted to leak their decryption privileges for financial gain without the risk of being caught as the decryption privilege could be shared by multiple users who own the same set of attributes. We propose a new multiauthority CP-ABE with blackbox and public traceability,where the private keys are assigned by the cooperation between one central authority and multi-authorities. The performance and security analyses indicate that the proposed scheme is highly efficient and provably secure under the security model.

关键词： CP-ABE multi-authority User accountability

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NC-MACPABE: Non-centered multi-authority proxy re-encryption based on CP-ABE for cloud storage systems

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Journal of Central South University 2017年第4期24卷 807-818页

作者：徐小龙张栖桐周静岚 College of Computer Nanjing University of Posts and Telecommunications Nanjing 210003 China State Key Laboratory for Novel Software Technology (Nanjing University) Nanjing 210046 China

The cloud storage service cannot be completely trusted because of the separation of data management and ownership, leading to the difficulty of data privacy protection. In order to protect the privacy of data on untrusted servers of cloud storage, a novel multi-authority access control scheme without a trustworthy central authority has been proposed based on CP-ABE for cloud storage systems, called non-centered multi-authority proxy re-encryption based on the cipher-text policy attribute-based encryption(NC-MACPABE). NC-MACPABE optimizes the weighted access structure(WAS) allowing different levels of operation on the same file in cloud storage system. The concept of identity dyeing is introduced to improve the users' information privacy further. The re-encryption algorithm is improved in the scheme so that the data owner can revoke user's access right in a more flexible way. The scheme is proved to be secure. And the experimental results also show that removing the central authority can resolve the existing performance bottleneck in the multi-authority architecture with a central authority, which significantly improves user experience when a large number of users apply for accesses to the cloud storage system at the same time.

关键词： cloud storage data privacy proxy re-encryption multi-authority

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Blockchain Access Control Scheme Based on multi-authority Attribute-Based Encryption

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国际计算机前沿大会会议论文集 2022年第2期 105-124页

作者： Yang Li Baoyue Qi Mengmeng Wang Jianming Zhu Xiuli Wang School of Information Central University of Finance and EconomicsBeijing 100081China Engineering Research Center of State Financial Security Ministry of EducationCentral University of Finance and EconomicsBeijing 102206China Computer Science Department University College LondonGower StreetLondon WC16BTUK

Blockchain has been widely used in many fields because it can solve the problem of information asymmetry and enable users who do not trust each other to collaborate without the participation of third-party intermediaries.Existing blockchain access control schemes usually use attribute-based encryption,but most of them adopt traditional single-attribute authority for attribute authorization,which has the problem that the authority is overburdened and must be fully credible.This paper proposes a blockchain access control scheme based on multiauthority attribute-based encryption by improving the existing blockchain privacy protection method.Autonomous identity management is performed through the blockchain to complete the initialization of user identity and the issuance of attribute certificates.Attribute authorities are selected using the reputation proof consensusmechanism.The distributed key generation protocol is used to generate keys,and the linear secret sharing scheme is improved.The hierarchical relationship of the access structure is used to encrypt and access control the private data that need to be uploaded to the blockchain.According to the comparison with other blockchain access control schemes,the scheme proposed in this paper has been improved in terms of security and efficiency.

关键词： Access control Blockchain Attribute-based encryption multi-authority

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Research on multi-authority CP-ABE Access Control Model in multicloud

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China Communications 2020年第8期17卷 220-233页

作者： Shengli Zhou Guangxuan Chen Guangjie Huang Jin Shi Ting Kong Department of Computer and Information Security Zhejiang Police CollegeHangzhou 310053China Institute of Big-data and Network Security Zhejiang Police CollegeHangzhou 310053China Institute of Software Chinese Academy of SciencesBeijing 100190China

In order to solve the problems of data sharing security and policy conflict in multicloud storage systems(MCSS), this work designs an attribute mapping mechanism that extends ciphertext policy attribute-based encryption(CP-ABE), and proposes a multi-authority CP-ABE access control model that satisfies the need for multicloud storage access control. The mapping mechanism mainly involves the tree structure of CP-ABE and provides support for the types of attribute values. The framework and workflow of the model are described in detail. The effectiveness of the model is verified by building a simple prototype system, and the performance of the prototype system is analyzed. The results suggest that the proposed model is of theoretical and practical significance for access control research in MCSS. The CP-ABE has better performance in terms of computation time overhead than other models.

关键词： CP-ABE access control multicloud multi-authority trust

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