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Blockchain-Assisted Comprehensive Key Management in CP-ABE for Cloud-Stored Data

IEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENT 2023年第2期20卷 1745-1758页

作者： Liu, Suhui Yu, Jiguo Chen, Liquan Chai, Baobao Southeast Univ Sch Cyber Sci & Engn Nanjing 211102 Peoples R China Qilu Univ Technol Big Data Inst Jinan 250353 Peoples R China Qilu Univ Technol Shandong Fundamental Res Ctr Comp Sci Jinan 250353 Shandong Peoples R China Shandong Univ Sci & Technol Sch Comp Sci & Engn Qingdao 266590 Peoples R China

Public clouds have drawn increasing attention from academia and industry due to their high computational and storage performance. attribute-based encryption (ABE) is the most promising technology to simultaneously achieve confidentiality and fine-grained access control of the cloud-stored data. However, traditional ABE that relies on centralized authority faces several key management issues, such as the key escrow, key distribution, key tracking, key update, and heavy communication and computing overhead for users, which will cause security concerns and impede its widespread application. On the other hand, blockchain technology preserves distributed ledgers to ensure the immutability and transparency of data, which can further solve the security vulnerabilities caused by system centralization. This paper proposes a blockchain-assisted transformation method to solve all the key management problems mentioned above in ciphertext-policy ABE by utilizing technologies such as secret sharing protocols. In addition, our transformation method realizes two additional benefits: outsourced decryption and efficient user revocation, which are extremely valuable for practical implementations. We simulate a demonstration by adopting the most popular permissioned blockchain, Hyperledger Fabric. The security and efficiency analysis reveals that the scheme obtained from our transformation method can achieve replayable chosen-ciphertext security with extremely efficient decryption.

关键词： ciphertext-policy attribute-based encryption key management cloud blockchain hyperledger fabric

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Expressive CP-ABE Scheme for Mobile Devices in loT Satisfying Constant-Size Keys and ciphertexts

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IEEE ACCESS 2017年 5卷 3273-3283页

作者： Odelu, Vanga Das, Ashok Kumar Khan, Muhammad Khurram Choo, Kim-Kwang Raymond Jo, Minho Indian Inst Informat Technol Dept Comp Convergence Software Sricity 517588 India Int Inst Informat Technol Ctr Secur Theory & Algorithm Res Hyderabad 500032 Andhra Pradesh India King Saud Univ Ctr Excellence Informat Assurance Riyadh 12372 Saudi Arabia Univ Texas San Antonio Dept Informat Syst & Cyber Secur San Antonio TX 78249 USA Korea Univ Dept Comp Convergence Software Sejong Metropolitan City 30019 South Korea

Designing lightweight security protocols for cloud-based Internet-of-Things (IoT) applications for battery-limited mobile devices, such as smart phones and laptops, is a topic of recent focus. ciphertext-policy attribute-based encryption (CP-ABE) is a viable solution, particularly for cloud deployment, as an encryptor can "write" the access policy so that only authorized users can decrypt and have access to the data. However, most existing CP-ABE schemes are based on the costly bilinear maps, and require long decryption keys, ciphertexts and incur significant computation costs in the encryption and decryption (e.g. costs is at least linear to the number of attributes involved in the access policy). These design drawbacks prevent the deployment of CP-ABE schemes on battery-limited mobile devices. In this paper, we propose a new RSA-based CP-ABE scheme with constant size secret keys and ciphertexts (CSKC) and has O(1) time complexity for each decryption and encryption. Our scheme is then shown to be secure against a chosen-ciphertext adversary, as well as been an efficient solution with the expressive AND gate access structures (in comparison to other related existing schemes). Thus, the proposed scheme is suitable for deployment on battery-limited mobile devices.

关键词： Mobile devices cloud computing ciphertext-policy attribute-based encryption constant-size secret key constant-size ciphertext RSA-based cryptography

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Efficient attribute-based encryption Schemes for Secure Communications in Cyber Defense

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INTELLIGENT AUTOMATION AND SOFT COMPUTING 2016年第3期22卷 397-403页

作者： Mao, Yijun Zhang, Yue Chen, Min-Rong Li, Yongbiao Zhan, Yiju Sun Yat Sen Univ Sch Informat Sci & Technol Guangzhou 510275 Guangdong Peoples R China South China Agr Univ Coll Math & Informat Guangzhou 510640 Guangdong Peoples R China Xian Univ Posts & Telecommun Natl Engn Lab Wireless Secur Xian 710121 Peoples R China South China Normal Univ Sch Comp Sci Guangzhou 510631 Guangdong Peoples R China Shenzhen Univ Coll Informat Engn Shenzhen 518060 Peoples R China Jinan Univ Dept Comp Sci Guangzhou 510632 Guangdong Peoples R China Sun Yat Sen Univ Sch Engn Guangzhou 510275 Guangdong Peoples R China

How to securely transmit data over the cyber is an important problem in cyber defense. In this paper, we propose a ciphertext-policy attribute-based encryption (CP-ABE) scheme, in which the messages are encrypted together with access policy, while secret keys are associated with specified sets of attributes, and the secret keys can correctly decrypt the ciphertexts only when the attributes satisfy the associated access policy. Our proposed CP-ABE scheme is provably secure in the full model without random oracles, and has a tight security reduction. We stress that a tight security reduction implies a higher security or the requirement of smaller keys and ciphertext sizes to obtain the same security level, and thus make the scheme more efficient. Thus our scheme can be efficiently used to encrypt the transmitted data over cyber in a fine-grained manner.

关键词： Key-policy attribute-based encryption ciphertext-policy attribute-based encryption tight reduction standard model

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Partial policy hidden medical data access control method based on CP-ABE

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Journal of Ambient Intelligence and Humanized Computing 2024年 1-12页

作者： Huang, Jing Tang, Detao Jiang, Chenyu Chen, Fulong Zhang, Ji Xie, Dong Wang, Taochun Zhao, Chuanxin Wang, Chao Li, Jintao Anhui Normal University Anhui Wuhu241000 China Anhui Vocational Colledge of Defense Technology Anhui Liuan237000 China University of Southern Queensland ToowoombaQLD4350 Australia

The secure sharing and privacy protection of medical data are of great significance during the development of smart medical care. In order to achieve data sharing among medical institutions, ciphertext-policy attribute-based encryption (CP-ABE), a potential technology, allows users to encrypt data under access policies which are defined on certain attributes of the data consumer, and only allows the data consumer to decrypt those attributes conforming to the access policy. However, some existing CP-ABE schemes still have some shortcomings. For example, the efficiency of encryption and decryption is not high enough, and some cannot support more sufficient and expressive access structures. To solve the above problems, combined with blockchain, this paper presents a CP-ABE scheme with partial policy hiding based on prime order bilinear groups. Extensive experiment and analysis results reveal that the proposed scheme protects the privacy of users and realizes that attribute values are hidden in the access policy. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Access control Blockchain ciphertext-policy attribute-based encryption Smart healthcare

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Security Protection of System Sharing Data with Improved CP-ABE encryption Algorithm under Cloud Computing Environment

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AUTOMATIC CONTROL AND COMPUTER SCIENCES 2019年第4期53卷 342-350页

作者： Xue, Shumin Ren, Chengjuan Baoji Univ Arts & Sci Sch Comp Baoji 721016 Shaanxi Peoples R China

As the scale of cloud computing expands gradually, the security of data sharing in cloud computing environment is facing more and more challenges. In this study, an improved, efficient data encryption method was proposed, which was based on ciphertext policy attribute-based encryption and controlled time cost using fixed-length ciphertext. The generation and aggregation of public and private keys and the encryption and decryption of data were introduced. Then simulation experiments were carried out in the cloud computing environment. Compared with the traditional ciphertext-policy attribute-based encryption (CP-ABE) algorithm, the improved algorithm had better performance in dealing with massive data and multi-user attributes although the steps increased. The comparison with other improved algorithms suggested that the improved algorithm put forward in this study had a high reliability, which indicated a good practicability of the improved algorithm in safe data sharing under cloud computing environment.

关键词： cloud computing data sharing data encryption data security ciphertext-policy attribute-based encryption fixed length encryption

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Requester-Centric CP-ABE Combining Removing Escrow and Outsourcing Decryption 11th

Requester-Centric CP-ABE Combining Removing Escrow and Outso...

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11th International Symposium on Cyberspace Safety and Security (CSS)

作者： Yao, Wang Wu, Faguo Zhang, Xiao Beihang Univ Key Lab Math Informat & Behav Semant Minist Educ Beijing 100191 Peoples R China Beihang Univ Sch Math & Syst Sci Beijing 100191 Peoples R China Peng Cheng Lab Shenzhen 518055 Guangdong Peoples R China Beihang Univ Beijing Adv Innovat Ctr Big Data & Brain Comp Beijing 100191 Peoples R China

ISBN: (纸本)9783030373528;9783030373511

Key escrow and low efficiency are two practical bottlenecks of attribute-based encryption. In this paper, a Requester-Centric CP-ABE (RC-CP-ABE) combining removing escrow and outsourcing decryption is proposed. By the bilinear map of composite order, we optimized the computational complexity of key transformation in the case of a large number of attributes. Without adding roles in the system, data requesters can undertake the key transformation which make them the center in the interactive process and the bridge linking removing escrow with outsourcing decryption. Security analysis has been made to prove our algorithm secure.

关键词： ciphertext-policy attribute-based encryption Requester-centric Outsourcing decryption Removing Escrow

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AnonyCast: Privacy-Preserving Location Distribution for Anonymous Crowd Tracking Systems 15

AnonyCast: Privacy-Preserving Location Distribution for Anon...

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ACM International Joint Conference on Pervasive and Ubiquitous Computing (UbiComp)

作者： Higuchi, Takamasa Martin, Paul Chakraborty, Supriyo Srivastava, Mani Osaka Univ Suita Osaka 565 Japan Univ Calif Los Angeles Los Angeles CA USA IBM Res Corp Yorktown Hts NY USA

ISBN: (纸本)9781450335744

Fusion of infrastructure-based pedestrian tracking systems and embedded sensors on mobile devices holds promise for providing accurate positioning in large public buildings. However, privacy concerns regarding handling of sensitive user location data potentially disrupt the adoption of such systems. This paper presents AnonyCast, a novel privacy-aware mechanism for delivering precise location information measured by crowd-tracking systems to individual pedestrians' smartphones. AnonyCast uses sparsely placed Bluetooth Low Energy transmitters to advertise location-dependent, time-varying keys. Using location measurements, AnonyCast estimates a subset of keys that each pedestrian's phone receives along its path. By combining a cryptography scheme called CP-ABE with a novel greedy algorithm for key selection, it encrypts each path before publishing, allowing users to decrypt only their own trajectories. The results from field experiments show that AnonyCast delivers accurate locations over 84% of time, bounding probability of unauthorized access to one's location below 1%.

关键词： Location privacy crowd tracking trajectory identification ciphertext-policy attribute-based encryption

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An Efficient Framework for Verifiable Access Control based Dynamic Data Updates in Public Cloud 13th

An Efficient Framework for Verifiable Access Control Based D...

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13th International Conference on Distributed Computing and Internet Technology (ICDCIT)

作者： Sabitha, S. Rajasree, M. S. Engn Coll Trivandrum Kerala India IIITM K Trivandrum Kerala India

ISBN: (纸本)9783319504728;9783319504711

attribute-based encryption enables the users to get the data only if attributes of the users are satisfied with the access policy embedded in the ciphertext. Whenever it is used in a collaborative environment, user's claim policy has to be verified before permitting them to update the data. In the existing system, it is verified by the computationally expensive attribute-based signature. We are proposing an efficient method to compute the signature of the encrypted message and claim policy, which enables claim policy verification and thereby allow the users to modify the data. In this system, public cloud server (PCS) permits the users to modify the outsourced data in the cloud after verifying the user's claim policy signature. It does not disclose the claim policy to the cloud service provider, PCS, and unauthorized users. Data owner is able to verify the integrity of the outsourced data set to ensure that the data is always intact with him. He can also validate the updated data by incorporating the signature. The proposed scheme is privacy preserving and avoids insider attack.

关键词： Cloud computing ciphertext-policy attribute-based encryption Remote data integrity Verification Authenticity

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Multi-keyword Ranked Searchable encryption Supporting CP-ABE Test

Multi-keyword Ranked Searchable Encryption Supporting CP-ABE...

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IEEE International Conference on Computing, Communications and IoT Applications (IEEE ComComAp)

作者： Wu, Chuxin Zhang, Peng Liu, Hongwei Liu, Yuhong Shenzhen Univ Coll Elect & Informat Engn ATR Key Lab Natl Def Technol Shenzhen Peoples R China Shenzhen Technol Univ Shenzhen Peoples R China Santa Clara Univ Dept Comp Engn Santa Clara CA 95053 USA

ISBN: (纸本)9781728119731

Internet of Things (IoT) and cloud computing are promising technologies that change the way people communicate and live. As the data collected through IoT devices often involve users' private information and the cloud is not completely trusted, users' private data are usually encrypted before being uploaded to cloud for security purposes. Searchable encryption, allowing users to search over the encrypted data, extends data flexibility on the premise of security. In this paper, to achieve the accurate and efficient ciphertext searching, we present an efficient multi-keyword ranked searchable encryption scheme supporting ciphertext-policy attribute-based encryption (CP-ABE) test (MRSET). For efficiency, numeric hierarchy supporting ranked search is introduced to reduce the dimensions of vectors and matrices. For practicality, CP-ABE is improved to support access right test, so that only documents that the user can decrypt are returned. The security analysis shows that our proposed scheme is secure, and the experimental result demonstrates that our scheme is efficient.

关键词： searchable encryption multi-keyword search ranked search ciphertext-policy attribute-based encryption

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Anonymous-CPABE: Privacy Preserved Content Disclosure for Data Sharing in Cloud 28

Anonymous-CPABE: Privacy Preserved Content Disclosure for Da...

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28th International Conference on Architecture of Computing Systems (ARCS)

作者： Sabitha, S. Rajasree, M. S. Coll Engn Dept Comp Sci & Engn Trivandrum Kerala India IIITM K Trivandrum Kerala India

ISBN: (纸本)9783319160863;9783319160856

Healthcare Providers are widely using Cloud Computing to securely share Electronic Health Record(EHR). Entire EHR data cannot be disclosed to all the users with different privilege level, since it is more privacy sensitive. So Healthcare Provider has to enforce a privacy preserved access control mechanism to efficiently share EHR. Privacy preserved secure data sharing is one of the most challenging issues in cloud environment. Existing access control mechanisms for data sharing do not consider the privacy of individuals, who are the subjects of data which is being shared while preventing user revocation problem. To address these problems, we are proposing a novel idea in which, users whose attributes satisfy the access policy and access rights are effective in access time can recover the corresponding data. Proposed scheme is able to ensure security, integrity, privacy preserved fine-grained access control and prevent data mining attacks on shared data. Even though this paper focuses on EHR sharing, it can be generalized to privacy preserved data sharing.

关键词： Cloud computing ciphertext-policy attribute-based encryption Re-encryption Anonymization

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