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检索条件"主题词=Ciphertext-policy Attribute-based Encryption"

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attribute Revocable attribute-based encryption for Decentralized Disruption-Tolerant Military Networks 3

Attribute Revocable Attribute-Based Encryption for Decentral...

引用

3rd International Symposium on Computing and Networking (CANDAR)

作者： Nomura, Kenta Mohri, Masami Ii, Yoshiaki Si Iiraisi Morii, Masakatu Kobe Univ Kobe Hyogo 6578501 Japan Gifu Univ Gifu 5011193 Japan

ISBN: (纸本)9781467397971

Disruption-tolerant network technologies are becoming solutions to access the confidential information or command by exploiting external storage node. It is necessary to encrypt the shared data to prevent illegal access to ciphertext by the third party. It is expected that commanders could control whether the user can decrypt the ciphertext or not. Besides, it is essential that a key authority distributing keys to users is decentralized to several authorities for avoiding the invasion from enemy. Thus, ciphertext-policy attribute-based encryption (CP-ABE) as a suitable encryption scheme for confidential data share and transmission is attracted attention under the military environment. In CP-ABE, the secret key of a user is associated with a set of atrributes;when attributes satisfy the access structure, the ciphertext is able to be decrypted. In this paper, we propose a CP-ABE scheme which can revoke attribute immediately with no updating user's secret key for attribute revocation. In addition, the length of key and ciphertext are fixed. Furthermore the proposed scheme has been compared with other CP-ABE schemes in key size, ciphertext size to validate its efficiency.

关键词： disruption-tolerant network ciphertext-policy attribute-based encryption multiple key authorities attribute revocation forward secrecy

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attribute-based Weighted Keyword Search Scheme Supporting Multi-Search Mechanism in Fog Computing 7

Attribute-Based Weighted Keyword Search Scheme Supporting Mu...

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7th IEEE International Conference on Cyber Security and Cloud Computing (CSCloud) / 6th IEEE International Conference on Edge Computing and Scalable Cloud (EdgeCom)

作者： Wang, Shulan Li, Yuan Wang, Haiyan Zhang, Xi Chen, Jianyong Shenzhen Univ Coll Comp Sci & Software Engn Shenzhen Peoples R China Shenzhen Technol Univ Coll Big Data & Internet Shenzhen Peoples R China Peng Cheng Lab Cyberspace Secur Res Ctr Shenzhen Peoples R China

ISBN: (纸本)9781728165509

With the popularity of intelligent terminal, fog computing as a new generation of internet technology can integrate the computing power of terminals and improve the effective utilization of social resources. At the same time, more and more data owners store ciphertext in the network. Hence, the advent of searchable encryption (SE) scheme enables searchers to search ciphertext without downloading all of it. However, the existing SE scheme cannot identify the matching degree of keywords and ciphertext. Besides, these schemes can only provide one or two search mechanism. In this paper, we propose a ciphertext-policy attribute-based weighted keyword searchable encryption scheme (ABWKS-MSM) in fog computing in order to solve the matching degree issue and provide multi-search mechanism, so that it becomes more friendly to fog computing applications. Furthermore, the proposed weighted keyword model can reduce the computational and storage cost. Finally, the performance analysis is also given, which proves that our scheme is efficient and feasible in fog computing.

关键词： Data security Searchable encryption Multi-search mechanism ciphertext-policy attribute-based encryption Fog computing

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attribute-based encryption scheme supporting decryption outsourcing and attribute revocation in cloud storage 20

Attribute-based encryption scheme supporting decryption outs...

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20th IEEE International Conference on Computational Science and Engineering (CSE) / 15th IEEE/IFIP International Conference on Embedded and Ubiquitous Computing (EUC)

作者： Liu, Hongwei Zhu, Ping Chen, Zehong Zhang, Peng Jiang, Zoe L. Shenzhen Univ Coll Informat Engn Shenzhen Peoples R China Shenzhen Univ Coll Informat Engn ATR Key Lab Natl Def Technol Shenzhen Peoples R China Harbin Insititute Technol Shenzhen Grad Sch Shenzhen Peoples R China Guangdong Prov Key Lab High Performance Comp Guangzhou Guangdong Peoples R China

ISBN: (纸本)9781538632215

Aiming to reduce the user's computational overhead and tackle the attribute revocation issue, an attribute-based encryption scheme supporting decryption outsourcing and attribute revocation is proposed in this paper. The proposed scheme outsources some decryption computational tasks to a cloud server such that the computational overhead on the user is simple and constant. We also propose an efficient attribute revocation method which concentrates on the update of the ciphertexts and users' secret keys associated with the corresponding revoked attributes. Moreover, the security analysis indicates that the proposed scheme can resist collusion attacks, and ensure forward and backward secrecy. Experiment results show that our scheme is more efficient compared with other scheme in the literature.

关键词： Cloud storage ciphertext-policy attribute-based encryption outsourced decryption attribute revocation

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A Secure Image-Video Retrieval Scheme with attribute-based encryption and Multi-feature Fusion in Smart Grid

A Secure Image-Video Retrieval Scheme with Attribute-Based E...

引用

4th International Conference on Science of Cyber Security (SciSec)

作者： Dang, Qian Zhao, Bo Sun, Biying Qiu, Yu Du, Chunhui State Grid Gansu Informat & Telecommun Co Lanzhou 730050 Peoples R China State Grid Gansu Elect Power Co Lanzhou 730000 Peoples R China

ISBN: (纸本)9789811977688;9789811977695

With the continuous development of smart grid, massive sensitive videos of power grid are stored in semi-trusted cloud servers, which leads to various security threats. And the existing secure video retrieval solutions are difficult to achieve both high retrieval rate and accuracy. We propose a novel secure video retrieval scheme in smart grid based on image content, by utilizing symmetric searchable encryption technology with attribute-based encryption and multi-feature fusion. Fine-grained access control is achieved for sensitive video data to eliminate illegal authorized access. This scheme converts the video into a keyframe set and transforms the difficult video secure retrieval problem to the more mature image secure retrieval region, which can effectively reduce the overhead of video secure retrieval and improve the retrieval accuracy. Security analysis demonstrates that the proposed scheme can preserve the privacy of data, resist known ciphertext attacks, known background attacks and collusion attacks. The experimental results indicate that the proposed scheme has the best balance between retrieval efficiency and retrieval accuracy among the three comparison schemes. The proposed scheme is feasible in the smart grid application scenario.

关键词： Smart grid ciphertext-policy attribute-based encryption Image content-based video retrieval Locality-sensitive hash Multi-feature fusion

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Expressive CP-ABE with Partially Hidden Access Structures 12

Expressive CP-ABE with Partially Hidden Access Structures

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7th ACM Symposium on Information, Computer and Communications Security (ASIACCS)

作者： Lai, Junzuo Deng, Robert H. Li, Yingjiu Singapore Management Univ Sch Informat Syst Singapore Singapore

ISBN: (纸本)9781450313032

In a traditional ciphertext-policy attribute-based encryption (CP-ABE) scheme, an access structure, also refereed to as ciphertext-policy, is sent along with a ciphertext explicitly, and anyone who obtains a ciphertext can know the access structure associated with the ciphertext. In certain applications, access structures contain sensitive information and must be protected from everyone except the users whose private key attributes satisfy the access structures. In this paper, we first propose a new model for CP-ABE with partially hidden access structures. In our model, each attribute consists of two parts: an attribute name and its value;if the private key attributes of a user do not satisfy the access structure associated with a ciphertext, the specific attribute values of the access structure are hidden, while other information about the access structure is public. based on the CP-ABE scheme proposed by Lewko et al. [14] recently, we then present an efficient construction of CP-ABE with partially hidden access structures. Compared to previous works in this field, our construction is more flexible and expressive and is proven fully secure in the standard model.

关键词： ciphertext-policy attribute-based encryption Partially Hidden Access Structure Dual System encryption

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A Blockchain-based Access Control System for Cloud Storage

A Blockchain-Based Access Control System for Cloud Storage

引用

IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus)

作者： Sukhodolskiy, Ilya Zapechnikov, Sergey Natl Res Nucl Univ MEPhI Dept Cryptol & Cybersecur Moscow Engn Phys Inst Moscow Russia

ISBN: (纸本)9781538643402

In this paper, we present a prototype of multi-user system for access control to datasets stored in an untrusted cloud environment. Cloud storage like any other untrusted environment needs the ability to secure share information. Our approach provides an access control over the data stored in the cloud without the provider participation. The main tool of access control mechanism is ciphertext-policy attribute-based encryption scheme with dynamic attributes. Using a blockchain-based decentralized ledger, our system provides immutable log of all meaningful security events, such as key generation, access policy assignment, change or revocation, access request. We propose a set of cryptographic protocols ensuring privacy of cryptographic operations requiring secret or private keys. Only ciphertexts of hash codes are transferred through the blockchain ledger. The prototype of our system is implemented using smart contracts and tested on Ethereum blockchain platform.

关键词： cloud storage attribute-based access control ciphertext-policy attribute-based encryption blockchain

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Multi-authority attribute-based encryption scheme with constant-size ciphertexts and user revocation

Multi-authority attribute-based encryption scheme with const...

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13th International Conference on Information Security Practice and Experience (ISPEC) / 3rd International Symposium on Security and Privacy in Social Networks and Big Data (SocialSec)

作者： Zhang, Xiao Wu, Faguo Yao, Wang Wang, Zhao Wang, Wenhua Beihang Univ Sch Math & Syst Sci Beijing 100191 Peoples R China Beihang Univ Ecole Cent Pekin Sino French Engineer Sch Beijing Peoples R China Minist Educ Key Lab Math Informat & Behav Semant Beijing Peoples R China Beihang Univ Beijing Adv Innovat Ctr Big Data & Brain Comp Beijing Peoples R China AVIC Econ & Technol Res Estab Beijing Peoples R China

ciphertext-policy attribute-based encryption (CP-ABE) is regarded as one of the most suitable technologies for data access control in cloud storage system. It gives data owners direct and flexible control on access policies. However, there still exists practicality concerns in CP-ABE applications, for example, the key escrow problem, user revocability, and large ciphertext size. Considering these problems, we propose a multi-authority attribute-based encryption scheme with constant-size ciphertexts and user revocation for threshold access policy in this paper. The security proof shows that the proposed scheme is selectively secure under the augmented multi-sequence of exponents decisional Diffie-Hellman assumption, and it also achieves forward security, backward security, and collusion-resistance.

关键词： ciphertext-policy attribute-based encryption multi-authority attribute-based encryption threshold access policy user revocation

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Insecurity of an Dynamic User Revocation and Key Refreshing for attribute-based encryption Scheme 10

Insecurity of an Dynamic User Revocation and Key Refreshing ...

引用

10th International Conference on Computational Intelligence and Security CIS 2014

作者： Wang, Changji Lin, Haitao Xu, Xilei Zheng, Kangjia Xia, Xiaonan Yunnan Univ Natl Pilot Sch Software Kunming Peoples R China Sun Yat Sen Univ Sch Informat Sci & Technol Guangzhou Guangdong Peoples R China

ISBN: (纸本)9781479974344

Cloud computing has generated a major impact on the global IT ecosystem, which promises economic advantages, speed, agility, flexibility, virtually infinite elasticity and innovation. However, data security and privacy remain the biggest barriers to widespread adoption of cloud services. To address the problem of fine-grained access control over encrypted data that is faced by cloud services, ciphertext-policy attribute-based encryption (CP-ABE) technology was proposed in recent years and has aroused great concern of researchers. Although CP-ABE schemes provide the ability for data owner-centric protection in cloud services, they are not very practical with the respect to the efficiency and scalability of access right revocation and key refreshing. Recently Xu and Martin proposed a dynamic user revocation and key refreshing model for CP-ABE schemes, and presented a concrete construction based on Bethencourt et al.'s CP-ABE scheme. They claimed that their construction is efficient and provable secure. However, after revisiting the construction, we demonstrate that cloud service provider can not perform data retrieval task in their construction, and their construction cannot achieve one-to-many encryption.

关键词： ciphertext-policy attribute-based encryption Dynamic User Revocation Key Refreshing Cloud Computing

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A NOVEL DYNAMIC KEY MANAGEMENT SCHEME FOR WIRELESS SENSOR NETWORKS

A NOVEL DYNAMIC KEY MANAGEMENT SCHEME FOR WIRELESS SENSOR NE...

引用

4th IEEE International Conference on Broadband Network and Multimedia Technology (IEEE IC-BNMT 2011)

作者： Chen, Chen Huang, Zheng Wen, Qiaoyan Fan, Yajun Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

ISBN: (纸本)9781612841564

The key management of wireless sensor networks is one of the most important research topics for the secure communications. In light of the unique characteristics in Wireless sensor network such as large scale of deployment, mobility of nodes, node failures, communication failures and dynamic network topology, many dynamic key management schemes, such as SHELL and LOCK, have been proposed to guarantee the security of key management. But they could not conipletely. address. the collusion problem of key management in. wireless sensor networks. In this paper, we devote to solving this problem and present a novel scheme for secure communications in wireless sensor networks. Our scheme follows the architecture of the three layers in LOCK. Concretely, we employ the ciphertext-policy attribute based encryption to refresh the group key in the upper layer and use EBS in the lower layer. Compared with related ones, our scheme can avoid the collusion attacks. Moreover, in the aspect of communication overhead, the number of messages for rekeying in our scheme can be largely reduced.

关键词： Wireless sensor networks Dynamic key management ciphertext-policy attribute-based encryption collusion-resistant

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TATIS: Trustworthy APIs for Threat Intelligence Sharing with UMA and CP-ABE 12th

TATIS: Trustworthy APIs for Threat Intelligence Sharing with...

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12th International Symposium on Foundations and Practice of Security (FPS)

作者： Preuveneers, Davy Joosen, Wouter Katholieke Univ Leuven Imec DistriNet Celestijnenlaan 200A B-3001 Heverlee Belgium

ISBN: (纸本)9783030453718;9783030453701

Threat intelligence platforms offer cyber emergency teams and security stakeholders access to sightings of cyberthreats and indicators of compromise. Given the sensitivity of the information, access may be restricted to certain members within an organization, offered to the general public, or anything in between. Service providers that host such platforms typically expose APIs for threat event producers and consumers, and to enable interoperability with other threat intelligence platforms. Not only is API security a growing concern, the implied trust by threat event producers and consumers in the platform provider remains a non-trivial challenge. This paper addresses these challenges by offering protection against honest but curious platform providers, and putting the access control back into the hands of the owner or producer of the threat events. We present TATIS, a solution for fine-grained access control to protect threat intelligence APIs using User Managed Access (UMA) and ciphertext-policy attribute-based encryption (CP-ABE). We test the feasibility of our solution using the Malware Information Sharing Platform (MISP). We validate our contribution from a security and privacy point of view. Experimental evaluation on a real-world OSINT threat intelligence dataset illustrates our solution imposes an acceptable performance overhead on the latency of API requests.

关键词： Threat intelligence API security User Managed Access ciphertext-policy attribute-based encryption

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