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Comment on "Circuit ciphertext-policy attribute-based Hybrid encryption With Verifiable Delegation in Cloud Computing"

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IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS 2021年第2期32卷 392-393页

作者： Cao, Zhengjun Markowitch, Olivier Shanghai Univ Dept Math Shangda Rd 99 Shanghai 200444 Peoples R China Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Xitucheng Rd 10 Beijing Peoples R China Univ Libre Bruxelles Comp Sci Dept Blvd Triomphe CP 2121050 Brussels Belgium

The scheme [1] is flawed because: (1) its circuit access structure is confusingly described;(2) the cloud server cannot complete the related computations;(3) some users can conspire to generate new decryption keys, wi... 详细信息

关键词： Servers encryption Cloud computing Logic gates Indexes Wires Outsourcing ciphertext-policy attribute-based encryption verifiable delegation multilinear map hybrid encryption

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Large Universe ciphertext-policy attribute-based encryption with Efficient Revocation

Large Universe Ciphertext-Policy Attribute-Based Encryption ...

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2017 2nd International Conference on Electrical, Automation and Mechanical Engineering(EAME2017)

作者： Lei Sun Shuaili Wang Zuohui Li Guangbo Wang Zhengzhou Information Science and Technology Institute

In this paper, we propose a large universe ciphertextpolicy attribute based encryption(ABE) scheme with efficient revocation. To achieve the revocation, we divide the master key into two parts: delegation key and secret key, which are sent to the cloud provider and user separately. Note that, our scheme is proved selectively secure in the standard model under q-type assumption. Finally, we give the concrete analysis associated with our scheme including security requirements, functionality and performance.

关键词： ciphertext-policy attribute-based encryption large universe attribute level user revocatio

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ciphertext-policy attribute-based delay encryption

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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTER SECURITY 2023年第2期22卷 167-185页

作者： Chen, Lijiao Lv, Kewei Chinese Acad Sci Inst Informat Engn State Key Lab Informat Secur Beijing 100093 Peoples R China State Key Lab Cryptol POB 5159 Beijing 100878 Peoples R China Univ Chinese Acad Sci Sch Cyber Secur Beijing 100049 Peoples R China Chinese Acad Sci Data Assurance & Commun Secur Res Ctr Beijing 100093 Peoples R China

Timed-release CP-ABE can provide fine-grained and timed-release access control while ensuring data confidentiality. Existing schemes usually rely on a trusted third-party called time server. This paper proposes a novel timed-release CP-ABE scheme named ciphertext-policy attribute-based delay encryption (CP-ABDE), which does not require a time server. Specifically, we formalise the notion of CP-ABDE and its system model and security model. Furthermore, we provide a formal construction that is secure under the decisional bilinear Diffie-Hellman assumption and repeated squaring assumption. Finally, performance analysis shows that the scheme performs well while achieving timed-release access control.

关键词： ciphertext-policy attribute-based encryption CP-ABE time-lock puzzle TLP access control timed-release delay

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A secure and efficient ciphertext-policy attribute-based Proxy Re-encryption for cloud data sharing

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FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE 2015年 52卷 95-108页

作者： Liang, Kaitai Au, Man Ho Liu, Joseph K. Susilo, Willy Wong, Duncan S. Yang, Guomin Yu, Yong Yang, Anjia City Univ Hong Kong Dept Comp Sci Hong Kong Hong Kong Peoples R China Hong Kong Polytech Univ Dept Comp Hong Kong Hong Kong Peoples R China ASTAR Inst Infocomm Res Singapore Singapore Univ Wollongong Sch Comp Sci & Software Engn Ctr Comp & Informat Secur Res Wollongong NSW 2522 Australia

Proxy Re-encryption (PRE) is a useful cryptographic primitive that allows a data owner to delegate the access rights of the encrypted data stored on a cloud storage system to others without leaking the information of the data to the honest-but-curious cloud server. It provides effectiveness for data sharing as the data owner even using limited resource devices (e.g. mobile devices) can offload most of the computational operations to the cloud. Since its introduction many variants of PRE have been proposed. A ciphertext-policy attribute-based Proxy Re-encryption (CP-ABPRE), which is regarded as a general notion for PRE, employs the PRE technology in the attribute-based encryption cryptographic setting such that the proxy is allowed to convert an encryption under an access policy to another encryption under a new access policy. CP-ABPRE is applicable to many network applications, such as network data sharing. The existing CP-ABPRE systems, however, leave how to achieve adaptive CCA security as an interesting open problem. This paper, for the first time, proposes a new CP-ABPRE to tackle the problem by integrating the dual system encryption technology with selective proof technique. Although the new scheme supporting any monotonic access structures is built in the composite order bilinear group, it is proven adaptively CCA secure in the standard model without jeopardizing the expressiveness of access policy. We further make an improvement for the scheme to achieve more efficiency in the re-encryption key generation and re-encryption phases. (C) 2014 Elsevier B.V. All rights reserved.

关键词： ciphertext-policy attribute-based encryption ciphertext-policy attribute-based proxy re-encryption Adaptive chosen-ciphertext security

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Two-layer ciphertext-policy attribute-based Proxy Re-encryption for Supporting PHR Delegation 19

Two-layer Ciphertext-Policy Attribute-Based Proxy Re-encrypt...

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International Computer Science and Engineering Conference (ICSEC)

作者： Wungpornpaiboon, G. Vasupongayya, S. Prince Songkla Univ Fac Engn Dept Comp Engn Hat Yai 90112 Songkhla Thailand

ISBN: (纸本)9781467378253

Medical treatment sometimes requires a case forwarding to a doctor who has a specific expertise. Typically, an electronic medical record (EMS) of a patient can be passed to another doctor without asking the patient because EMS belongs to the healthcare organization. Personal health record (PHR), however, is different because PHR is owned by an individual (e.g., patient) and all accesses to the PHR is controlled by its owner. This work proposes a two-layer ciphertext-policy attribute-based proxy re-encryption scheme (2-layer CP-ABPRE) for the PHR delegation process. The inner layer policy belongs to the PHR owner while the outer layer policy belongs to the doctors or experts that might want to delegate the PHR to other doctors or experts. This way, the PHR can be delegated to others while the PHR owner still has the control on his/her data. The evaluation results on the size of the resulting ciphertext PHR produced by the proposed method, are shown. The security issues of the proposed method are also discussed.

关键词： delegation access control personal health record ciphertext-policy attribute-based encryption proxy re-encryption

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Flexible and Efficient Multi-Authorization Data Sharing Scheme With Enhanced Privacy Protection

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INTERNATIONAL JOURNAL OF INTELLIGENT INFORMATION TECHNOLOGIES 2025年第1期21卷

作者： Zhong, Chen Yue, Qiuling Hainan Univ Sch Cyberspace Secur Sch Cryptol Haikou Peoples R China

The advancement of the digital economy relies on secure data sharing. However, most existing methods face challenges like single-points-of-failure, insufficient privacy protection, and low efficiency. To address these issues, this manuscript proposes a multi-authorization ciphertext-policy attribute-based encryption scheme to eliminate single-points-of-failure. The scheme achieves policy hiding using boolean sharing and pseudo-random functions, enhancing privacy protection. It also supports efficient user revocation and policy updates. Considering the constraints of practical environments, this manuscript employs an outsourcing computation and secure ciphertext de-duplication to reduce overhead. The scheme's adaptive security is proven under the standard model, and its performance is validated through simulations. The results demonstrate that this manuscript's scheme outperforms traditional multi-authorization ciphertext-policy attribute-based encryption in security and efficiency, making it ideal for resource-constrained data sharing scenarios.

关键词： ciphertext-policy attribute-based encryption Data Sharing Efficiency Multi-Authorization policy Hiding policy Update Privacy Protection Security User Revocation

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A lattice-based CP-ABE scheme with immediate attribute revocation

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INTERNATIONAL JOURNAL OF INFORMATION AND COMPUTER SECURITY 2025年第1-2期26卷 41-67页

作者： He, Miao Helil, Nurmamat Xinjiang Univ Coll Math & Syst Sci Xinjiang Peoples R China

ciphertext-policy attribute-based encryption (CP-ABE) is suitable for providing secure data-sharing services in the cloud storage scenario. However, attribute revocation in CP-ABE is a sticky issue. The research achievement on quantum computing makes the traditional CP-ABE no longer secure. Fortunately, lattice-based CP-ABE can resist quantum attacks. This paper proposes a lattice-based CP-ABE scheme with a tree access structure that supports the immediate revocation of attributes. This scheme is resistant to quantum and collusion attacks. When attribute revocation occurs, the semi-trusted third party implements the immediate attribute revocation to handle dynamic user permission changes immediately. The proposed re-encryption algorithm can effectively reduce the computational complexity of ciphertext re-encryption during attribute revocation, and the lazy ciphertext update method reduces the scope and size of the ciphertext update. Finally, it is shown that, under the standard model, the scheme is proven secure against chosen-plaintext attacks (CPA), and its security can be attributed to the learning with errors (LWE) difficulty problem.

关键词： lattice-cryptography ciphertext-policy attribute-based encryption CP-ABE attribute revocation collusion attacks learning with error LWE

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ciphertext-policy attribute-based Access Control with Effective User Revocation for Cloud Data Sharing System 4

Ciphertext-Policy Attribute-Based Access Control with Effect...

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4th International Conference on Advanced Cloud and Big Data (CBD)

作者： Vaanchig, Nyamsuren Chen, Wei Qin, Zhiguang Univ Elect Sci & Technol China Sch Informat & Software Engn Chengdu Peoples R China

ISBN: (纸本)9781509036776

With the development and benefits of cloud computing, nowadays more and more users outsource their data to third party cloud storage servers for ease of sharing and cost saving. ciphertext-policy attribute-based encryption (CP-ABE) is a promising tool for enabling fine-grained access control over the shared data in the cloud. However, the practical application of CP-ABE in cloud data sharing system also has its own inherent challenge to regard with user revocation. To address this challenge, the paper proposes a CP-ABE scheme which supports an effective user revocation mechanism by introducing "the essential attribute" and by considering minimally trusted proxy servers;the essential attribute must be included in both ciphertext and update-key. By excluding the revoked users from update-key (which is a part of a decryption key) and by re-encrypting the only component in ciphertexts, which is associated with the essential attribute, our scheme achieves immediate and complete user revocation mechanism in CP-ABE. The proposed scheme enables a scalable and fine-grained access control for cloud data sharing system. Our scheme provides more efficiency and security level simultaneously comparing to the existing user revocable CP-ABE scheme.

关键词： cloud data sharing access control ciphertext-policy attribute-based encryption user revocation

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ACS-HCA:An Access Control Scheme Under Hierarchical Cryptography Architecture

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Chinese Journal of Electronics 2019年第1期28卷 52-61页

作者： SHI Jiaoli HUANG Chuanhe HE Kai SHEN Xieyang State Key Lab of Software Engineering Computer SchoolWuhan University Collaborative Innovation Center of Geospatial Technology Jiujiang University Wuhan Textile University

Binding access policies to data,ciphertext-policy attribute-based encryption(CP-ABE)enables data access control to be independent from a certain application and lets users face data directly. It is regarded as one of the most suitable access control methods in cloud storage system and gets the attention of extensive researches. In those researches, Hierarchical cryptography architecture(HCA) is often applied to improve the efficiency of the system. There exist two open issues: illegal leakage of symmetric keys and low efficiency of revocation of an attribute of a user. We propose an Access control scheme under Hierarchical cryptography architecture(ACS-HCA). In this scheme,key derivation mechanism and forward derivation function are used to avoid the leakage of symmetric keys, All-orNothing transform is used to prevent the illegal reuse of symmetric keys, and attribute revocation is realized without re-issuing other users’ private keys. Analyses and simulations demonstrate that our scheme sustains less encrypting cost on each owner and less decrypting cost on each user, but gain high efficiency in revocation of an attribute of a user.

关键词： Cloud storage Access control ciphertext-policy attribute-based encryption Hierarchical cryptography architecture attribute revocation

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A fully distributed hierarchical attribute-based encryption scheme

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THEORETICAL COMPUTER SCIENCE 2020年 815卷 25-46页

作者： Ali, Mohammad Mohajeri, Javad Sadeghi, Mohammad-Reza Liu, Ximeng Amirkabir Univ Technol Dept Math & Comp Sci Tehran Iran Sharif Univ Technol Elect Res Inst Tehran Iran Fuzhou Univ Coll Math & Comp Sci Fuzhou 350108 Peoples R China Singapore Management Univ Sch Informat Syst Singapore 178902 Singapore

With the development of cloud computing, many enterprises have been interested in outsourcing their data to cloud servers to decrease IT costs and rise capabilities of provided services. To afford confidentiality and fine-grained data access control, attribute-based encryption (ABE) was proposed and used in several cloud storage systems. However, scalability and flexibility in key delegation and user revocation mechanisms are primary issues in ABE systems. In this paper, we introduce the concept of a fully distributed revocable ciphertext-policy hierarchical ABE (FDR-CP-HABE) and design the first FDR-CP-HABE scheme. Our scheme offers a high level of flexibility and scalability in the key delegation and user revocation phases. Moreover, our scheme is efficient and provides lightweight computation in the decryption phase. Indeed, by exploiting a computation outsourcing technique, most of the operations are executed by the powerful cloud server, and very few computations are left to the users. Also, the storage cost on the user side is significantly decreased as compared to similar schemes. Furthermore, using the hardness assumption of DBDH problem, we prove that our scheme is adaptively secure in the standard model. Our security analyses and implementation results indicate that our scheme is efficient, secure, and scalable. (C) 2020 Elsevier B.V. All rights reserved.

关键词： Cloud computing Hierarchical attribute-based encryption ciphertext-policy attribute-based encryption Access control

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