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检索条件"主题词=Ciphertext-policy attribute-based encryption"

共 99 条记录，以下是11-20 订阅

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TinyABE: Unrestricted ciphertext-policy attribute-based encryption for Embedded Devices and Low-Quality Networks 13th

TinyABE: Unrestricted Ciphertext-Policy Attribute-Based Encr...

引用

13th International Conference on the Theory and Application of Cryptographic Techniques in Africa (AFRICACRYPT)

作者： Venema, Marloes Alpar, Greg Radboud Univ Nijmegen Nijmegen Netherlands Open Univ Netherlands Heerlen Netherlands

ISBN: (纸本)9783031174322;9783031174339

ciphertext-policy attribute-based encryption (CP-ABE) has attracted much interest from the practical community to enforce access control in distributed settings such as the Internet of Things (IoT). In such settings, encryption devices are often constrained, having small memories and little computational power, and the associated networks are lossy. To optimize both the ciphertext sizes and the encryption speed is therefore paramount. In addition, the master public key needs to be small enough to fit in the encryption device's memory. At the same time, the scheme needs to be expressive enough to support common access control models. Currently, however, the state of the art incurs undesirable efficiency trade-offs. Existing schemes often have linear ciphertexts, and consequently, the ciphertexts may be too large and encryption may be too slow. In contrast, schemes with small ciphertexts have extremely large master public keys, and are generally computationally inefficient. In this work, we propose TinyABE: a novel CP-ABE scheme that is expressive and can be configured to be efficient enough for settings with embedded devices and low-quality networks. In particular, we demonstrate that our scheme can be configured such that the ciphertexts are small, encryption is fast and the master public key is small enough to fit in memory. From a theoretical standpoint, the new scheme and its security proof are non-trivial generalizations of the expressive scheme with constant-size ciphertexts by Agrawal and Chase (TCC'16, Eurocrypt'17) and its proof to the unbounded setting. By using techniques of Rouselakis and Waters (CCS'13), we remove the restrictions that the Agrawal-Chase scheme imposes on the keys and ciphertexts, making it thus more flexible. In this way, TinyABE is especially suitable for IoT devices and networks.

关键词： attribute-based encryption ciphertext-policy attribute-based encryption Short ciphertexts Efficient encryption

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Identity-based Access Control for Digital Content based on ciphertext-policy attribute-based encryption

Identity-based Access Control for Digital Content based on C...

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International Conference on Information Networking (ICOIN)

作者： Huang, Win-Bin Su, Wei-Tsung Peking Univ Dept Informat Management Beijing Peoples R China Aletheia Univ Dept Comp Sci & Informat Engn New Taipei Taiwan

ISBN: (纸本)9781479983421

Digital content is easily spread out in the era of cloud computing. However, the challenge is providing an identity-based access control mechanism to carry out the rating system for preventing specific digital content from being obtained by inappropriate users. In this paper, we proposed a novel identity-based access control approach for digital content based on ciphertext-policy attribute-based encryption (iDAC). In iDAC, the access control still works even the digital content is duplicated to another content server. Moreover, only one copy of encrypted digital content is required to share with multiple users. This could efficiently reduce the overhead of content servers. As shown in our performance analysis with respect of security, space complexity, and time complexity, iDAC outperforms the traditional access control list based and encryption-based access control approaches.

关键词： identity-based access control rating system ciphertext-policy attribute-based encryption

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Integrating ciphertext-policy attribute-based encryption with Identity-based Ring Signature to Enhance Security and Privacy in Wireless Body Area Networks 10

Integrating Ciphertext-Policy Attribute-Based Encryption wit...

引用

10th China International Conference on Information Security and Cryptology (Inscrypt)

作者： Wang, Changji Xu, Xilei Li, Yuan Shi, Dongyuan Yunnan Univ Natl Pilot Sch Software Kunming 650500 Peoples R China Sun Yat Sen Univ Sch Informat Sci & Technol Guangzhou 510275 Guangdong Peoples R China Sun Yat Sen Univ Guangdong Key Lab Informat Secur Technol Guangzhou 510275 Guangdong Peoples R China

ISBN: (纸本)9783319167459;9783319167442

The technology of wireless body area network (WBAN) has attracted intensive attention in recent years. For widespread deployment of WBANs, security and privacy issues must be addressed properly. Recently, Hu et al. proposed a fuzzy attribute-based signcryption scheme with the aim to provide security and privacy mechanisms in WBANs. In this paper, we first show Hu et al.'s scheme cannot achieve the claimed security properties. In particular, an adversary is capable of generating private keys for any set of attributes. Then we introduce a new cryptographic primitive named ciphertext-policy attribute-based ring signcryption (CP-ABRSC) by integrating the notion of ciphertext-policy attribute-based encryption with identity-based ring signature. We give formal syntax and security definitions for CP-ABRSC and present a provable secure CP-ABRSC scheme from bilinear pairings. Finally, we propose a novel access control framework for WBANs by exploiting CP-ABRSC scheme, which can not only provide semantic security, unforgeability and public authenticity, but also can provide participants privacy and fine-grained access control on encrypted health data.

关键词： Fuzzy identity-based signcryption Identity-based ring signature ciphertext-policy attribute-based encryption Wireless body area network

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A Threshold-based Key Generation Approach for ciphertext-policy attribute-based encryption 7

A Threshold-based Key Generation Approach for Ciphertext-Pol...

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International Conference on Ubiquitous and Future Networks

作者： Huang, Win-Bin Su, Wei-Tsung Liang, Chiang-Sheng Peking Univ Dept Informat Management Beijing Peoples R China Aletheia Univ Dept Comp Sci & Informat Engn New Taipei Taiwan

ISBN: (纸本)9781479989935

ciphertext-policy attribute-based encryption (CP-ABE) is proposed to provide identity-based access control which is suitable for cloud storage services. In CP-ABE, because the authority is responsible for key management, it must be trusted. There is only one authority in CP-ABE. Thus, CP-ABE may suffer a single point of failure. Although multi-authority ABE could solve this problem, attackers still can execute collusion attacks to compromise authorities. Thus, in this paper, we propose the threshold-based key generation approach (TKGA) for ciphertext-policy attribute-based encryption (CP-ABE). TKGA is a multi-authority approach which utilize the technologies of functional encryption and (n, k)-secret sharing. TKGA could efficiently impede collusion attacks because no single authority can directly generate secret keys. Thus, TKGA can be compromised if and only if at least k of n authorities are compromised by attackers. According to our security and performance evaluation, although TKGA has additional computation and communication overhead, TKGA can improve security by impeding collusion attacks.

关键词： Key generation ciphertext-policy attribute-based encryption Functional encryption Secret sharing

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A Survey on ciphertext-policy attribute-based encryption (CP-ABE) Approaches to Data Security on Mobile Devices and its Application to loT 17

A Survey on Ciphertext-Policy Attribute-based Encryption (CP...

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International Conference on Future Networks and Distributed Systems (ICFNDS)

作者： Moffat, Steve Hammoudeh, Mohammad Hegarty, Robert Manchester Metropolitan Univ Manchester Lancs England

ISBN: (纸本)9781450348447

The growth in Cloud Computing and the ubiquity of Mobile devices to access Cloud services has generated a new paradigm, Mobile Cloud Computing (MCC). While the benefits of storing and accessing data in the Cloud are well documented there are concerns relating to the security of such data through data corruption, theft, exploitation or deletion. Innovative encryption schemes have been developed to address the challenges of data protection in the Cloud and having greater control over who should be accessing what data, one of which is attribute-based encryption (ABE). ABE is a type of role-based access control encryption solution which allows data owners and data consumers or users to encrypt and decrypt based on their personal attributes (e.g. department, location, gender, role). A number of ABE schemes have been developed over the years but ABE in MCC has established its own paradigm driven by a) the use of mobile devices to access private data hosted in the Cloud and b) the physical limitations of the mobile device to perform complex computation in support of encryption and decryption in ABE. ABE in MCC is an evolving research field but given the breadth and strength of interest at time of writing it is timely to perform a survey. Due to the sheer volume of research, the survey has focused on one aspect of ABE - ciphertext-policy attribute-based encryption - in line with its prominence in ABE in MCC research to date. Further, given the significant developments and interest in IoT, the survey has since been extended to assess whether the research into mobile devices has been translated to the application of attribute-based encryption in IoT where the challenges to support complex computation and data transmission are potentially more complex given the much greater heterogeneity and resource restrictions of IoT devices.

关键词： ciphertext-policy attribute-based encryption CP-ABE Mobile device Mobile Cloud Computing MCC IoT

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Anonymous Leakage-Resilient ciphertext-policy attribute-based encryption Supporting Direct Revocation 2nd

Anonymous Leakage-Resilient Ciphertext-Policy Attribute-Base...

引用

2nd International Conference on Frontiers in Cyber Security (FCS)

作者： Gao, Xiaoxu Zhang, Leyou Hu, Gongcheng Xidian Univ Sch Math & Stat Xian 710126 Peoples R China

ISBN: (纸本)9789811508189;9789811508172

Leakage-resilient ciphertext-policy attribute-based encryption (LR-CP-ABE) is an important tool to achieve fine-grained access control of data and resist side-channel attacks. Privacy protection and user revocation are two practical problems it faces. However, most of the existing schemes fail to achieve user revocation while protecting user's privacy at present. To address the above problems, we propose an anonymous LR-CP-ABE scheme with user revocation in this paper, which is proven to be adaptively secure in the standard model under four static assumptions over composite order group. Furthermore, we also show the proposed scheme achieves the receivers anonymity which protects the users' privacy. The performance analyses confirm the feasibility of the proposed scheme.

关键词： Anonymous ciphertext-policy attribute-based encryption Direct revocation Leakage-resilient

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Searchable ciphertext-policy attribute-based encryption with Multi-Keywords for Secure Cloud Storage 18

Searchable Ciphertext-Policy Attribute-Based Encryption with...

引用

International Conference on Computing and Pattern Recognition (ICCPR)

作者： Zhao, Zhiyuan Sun, Lei Li, Zuohui Liu, Ying Zhengzhou Informat Sci & Technol Inst 62 Sci AveHigh Tech Zone Zhengzhou Henan Peoples R China

ISBN: (纸本)9781450364713

Searchable encryption is one of the most important techniques for the sensitive data outsourced to cloud server, and has been widely used in cloud storage which brings huge convenience and saves bandwidth and computing resources. A novel searchable cryptographic scheme is proposed by which data owner can control the search and use of the outsourced encrypted data according to its access control policy. The scheme is called searchable ciphertext-policy attribute-based encryption with multikeywords (CPABMKS). In the scheme, CP-ABE and keywords are combined together through the way that the keywords are regarded as the file attributes. To overcome the previous problems in cloud storage, access structures are hidden so that receivers cannot extract sensitive information from the ciphertext. At the same time, this scheme supports the multikeywords search, and the data owner can outsource the encryption operations to the private cloud that can reduce the data owner' calculation. The security of this scheme is proved based on the DBDH assumption. Finally, scheme evaluation shows that the CPABMKS scheme is practical

关键词： Cloud computing ciphertext-policy attribute-based encryption Keyword search Multi-keywords

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A ciphertext-policy attribute-based encryption based on Multi-valued Decision Diagram 10th

A Ciphertext-Policy Attribute-Based Encryption Based on Mult...

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10th IFIP TC 12 International Conference on Intelligent Information Processing (IIP)

作者： Zhang, Shaowei Li, Long Chang, Liang Gu, Tianlong Liu, Huadong Guilin Univ Elect Technol Guangxi Key Lab Trusted Software Guilin 541004 Peoples R China

ISBN: (纸本)9783030008284;9783030008277

ciphertext-policy attribute-based encryption (CP-ABE) is a kind of asymmetric encryption which is widely used in cyber-physical system and Internet of Things. In CP-ABE, access structure is an important component affecting the efficiency and performance greatly in several stages, such as encryption stage, key generation stage, decryption stage. However, the existing CP-ABE schemes have low efficiency because of the application of traditional access structures. In order to alleviate the aforementioned problems, this paper proposes a brand-new access structure based on multi-valued decision diagram (MDD). According to this access structure, we design a new CP-ABE scheme which performs better than many current schemes. First, our scheme supports multi-valued attributes directly. Second, the size of secret key is constant because it bears no relationship to the number of attributes. Third, the time complexity of decryption stage is O(1).

关键词： ciphertext-policy attribute-based encryption Multi-valued decision diagram Access structure

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A ciphertext-policy attribute-based encryption Scheme With Optimized ciphertext Size And Fast Decryption 17

A Ciphertext-Policy Attribute-based Encryption Scheme With O...

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ACM Asia Conference on Computer and Communications Security (ASIA CCS)

作者： Malluhi, Qutaibah M. Shikfa, Abdullatif Viet Cuong Trinh Qatar Univ Doha Qatar Hong Duc Univ Thanh Hoa Vietnam

ISBN: (纸本)9781450349444

We address the problem of ciphertext-policy attribute-based encryption with fine access control, a cryptographic primitive which has many concrete application scenarios such as Pay-TV, e-Health, Cloud Storage and so on. In this context we improve on previous LSSS based techniques by building on previous work of Hohenberger and Waters at PKC'13 and proposing a construction that achi- eves ciphertext size linear in the minimum between the size of the boolean access formula and the number of its clauses. Our construction also supports fast decryption. We also propose two interesting extensions: the first one aims at reducing storage and computation at the user side and is useful in the context of lightweight devices or devices using a cloud operator. The second proposes the use of multiple authorities to mitigate key escrow by the authority.

关键词： ciphertext-policy attribute-based encryption DNF access policy LSSS access policy Fast decryption multi-authority

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An Efficient and Expressive ciphertext-policy attribute-based encryption Scheme with Partially Hidden Access Structures 10th

An Efficient and Expressive Ciphertext-Policy Attribute-Base...

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10th International Conference on Provable Security (ProvSec)

作者： Cui, Hui Deng, Robert H. Wu, Guowei Lai, Junzuo Singapore Management Univ Sch Informat Syst Singapore Singapore Jinan Univ Dept Comp Sci Guangzhou Guangdong Peoples R China

ISBN: (纸本)9783319474229;9783319474212

A promising solution to protect data privacy in cloud storage services is known as ciphertext-policy attribute-based encryption (CP-ABE). However, in a traditional CP-ABE scheme, a ciphertext is bound with an explicit access structure, which may leak private information about the underlying plaintext in that anyone having access to the ciphertexts can tell the attributes of the privileged recipients by looking at the access structures. A notion called CP-ABE with partially hidden access structures [14,15,18,19,24] was put forth to address this problem, in which each attribute consists of an attribute name and an attribute value and the specific attribute values of an access structure are hidden in the ciphertext. However, previous CP-ABE schemes with partially hidden access structures only support access structures in AND gates, whereas a few other schemes supporting expressive access structures are computationally inefficient since they are built from bilinear pairings over the composite-order groups. In this paper, we focus on addressing this problem, and present an expressive CP-ABE scheme with partially hidden access structures in prime-order groups.

关键词： Cloud storage ciphertext-policy attribute-based encryption Access structures Data privacy Access control

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