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Weighted Attribute Based conditional proxy re-encryption in the Cloud

Computers, Materials & Continua 2025年第4期83卷 1399-1414页

作者： Xixi Yan Jing Zhang Pengyu Cheng Henan Key Laboratory of Network Cryptography Technology Network Information Security and Cryptography LaboratorySchool of SoftwareHenan Polytechnic UniversityJiaozuo454003China School of Computer Science and Technology Henan Polytechnic UniversityJiaozuo454000China

conditional proxy re-encryption(CPre)is an effective cryptographic primitive language that enhances the access control mechanism and makes the delegation of decryption permissions more granular,but most of the attribute-based conditional proxy re-encryption(AB-CPre)schemes proposed so far do not take into account the importance of user attributes.A weighted attribute-based conditional proxy re-encryption(WAB-CPre)scheme is thus designed to provide more precise decryption rights *** introducing the concept of weight attributes,the quantity of system attributes managed by the server is reduced *** the same time,a weighted tree structure is constructed to simplify the expression of access structure *** conditional proxy re-encryption,large amounts of data and complex computations are outsourced to cloud servers,so the data owner(DO)can revoke the user’s decryption rights directly with minimal *** scheme proposed achieves security against chosen plaintext attacks(CPA).Experimental simulation results demonstrated that the decryption time is within 6–9 ms,and it has a significant reduction in communication and computation cost on the user side with better functionality compared to other related schemes,which enables users to access cloud data on devices with limited resources.

关键词： Cloud service conditional proxy re-encryption user revocation weighted attribute

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conditional proxy re-encryption for Secure Big Data Group Sharing in Cloud Environment

Conditional Proxy Re-Encryption for Secure Big Data Group Sh...

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33rd IEEE Annual Conference on Computer Communications (IEEE INFOCOM)

作者： Son, Junggab Kim, Donghyun Hussain, Rasheed Oh, Heekuck Hanyang Univ Dept Comp Sci & Engn ERICA Campus Seoul South Korea North Carolina Cent Univ Dept Math & Phys Durham NC 27707 USA

ISBN: (纸本)9781479930883

conditional Pre (CPre) is a novel public key primitive which enables the group sharing of confidential data without revealing its plaintext or decryption key to outside the group member. Previously, several efforts are made to facilitate CPre in group data sharing in cloud environment. The main drawback of the state-of-art CPre schemes for this purpose is that whenever the group member changes, the originator of the data needs to download all of the existing data on the cloud, encrypt them again with a new condition value, and uploads them to the cloud. As a result, they are not suitable for secure big data sharing among group member in cloud environment. In this paper, we introduce a new CPre called the outsourcing CPre scheme (O-CPre) which reduces the client overhead drastically. When the membership of the group changes, in O-CPre, the originator only needs to select a new condition value and upload it to the cloud. In addition, O-CPre will move a part of client overhead at the initial setup stage and at the decryption of each message from the client to the cloud. As a result, O-CPre is much more suitable for secure big data sharing in cloud environment than the other existing schemes.

关键词： Cloud computing cloud storage big data proxy re-encryption conditional proxy re-encryption efficiency

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Chosen-ciphertext secure multi-hop identity-based conditional proxy re-encryption with constant-size ciphertexts

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THEOreTICAL COMPUTER SCIENCE 2014年第C期539卷 87-105页

作者： Liang, Kaitai Chu, Cheng-Kang Tan, Xiao Wong, Duncan S. Tang, Chunming Zhou, Jianying City Univ Hong Kong Dept Comp Sci Kowloon Hong Kong Peoples R China Inst Infocomm Res Infocomm Secur Dept Singapore 138632 Singapore Guangzhou Univ Sch Math & Informat Sci Guangzhou 510006 Guangdong Peoples R China

proxy re-encryption (Pre) allows one user to delegate the decryption rights of his/her ciphertexts to another user. Since the introduction of Multi-Hop Identity-Based Pre (MH-IBPre) by Green and Ateniese, the ciphertext size and the decryption complexity grow linearly in the number of re-encryption "hops". In this paper, for the first time, we propose an MH-IBPre that maintains the (constant) ciphertext size and computational complexity regardless of the number of re-encryption hops. Moreover, our scheme is bidirectional and also supports conditional re-encryption. The scheme is proven secure against selective identity and chosen-ciphertext attacks and collusion resistant in the standard model. As of independent interest, we also show that the conditional re-encryption can also be extended to a set of conditions. (C) 2014 Elsevier B.V. All rights reserved.

关键词： conditional proxy re-encryption Identity-based proxy re-encryption Bilinear map Chosen-ciphertext security Constant size ciphertext

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Identity-based conditional proxy re-encryption with fine grain policy

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COMPUTER STANDARDS & INTERFACES 2017年 52卷 1-9页

作者： Ge, Chunpeng Susilo, Willy Wang, Jiandong Fang, Liming Jiangsu Univ Technol Dept Comp Engn Changzhou Peoples R China Univ Wollongong Sch Comp & Informat Technol CCISR Wollongong NSW Australia Nanjing Univ Aeronaut & Astronaut Coll Comp Sci & Technol Nanjing Jiangsu Peoples R China

An identity-based conditional proxy re-encryption scheme (IB-CPre) allows a semi-trusted proxy to convert a ciphertext satisfying one condition, which is set by the delegator, under one identity to another without the necessity to reveal the underlying message. In ICISC 2012, Liang, Liu, Tan, Wong and Tang proposed an IB-CPre scheme, and left an open problem on how to construct chdsen-ciphertext secure IB-CPre supporting OR gates on conditions. In this work, we answer this aforementioned problem by constructing an identity-based conditional proxy re-encryption scheme with fine grain policy (IB-CPre-FG). In an IB-CPre-FG scheme, each ciphertext is labeled with a set of descriptive conditions and each re-encryption key is associated with an access tree that specifies which type of ciphertexts the proxy can re-encrypt. Furthermore, our scheme can be proved secure against adaptive access tree and adaptive identity chosen-ciphertext attack.

关键词： conditional proxy re-encryption Identity-based proxy re-encryption Chosen-ciphertext security

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On the security of two identity-based conditional proxy re-encryption schemes

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THEOreTICAL COMPUTER SCIENCE 2016年 652卷 18-27页

作者： He, Kai Weng, Jian Deng, Robert H. Liu, Joseph K. Jinan Univ Dept Comp Sci Guangzhou 510632 Guangdong Peoples R China Singapore Management Univ Sch Informat Syst Singapore 178902 Singapore Monash Univ Fac Informat Technol Clayton Vic 3800 Australia

proxy re-encryption allows a semi-trusted proxy with a re-encryption key to convert a delegator's ciphertext into a delegatee's ciphertext, and the semi-trusted proxy cannot learn anything about the underlying plaintext. If a proxy re-encryption scheme is indistinguishable against chosen-ciphertext attacks, its initialized ciphertext should be non-malleable. Otherwise, there might exist an adversary who can break the chosen-ciphertext security of the scheme. recently, Liang et al. proposed two proxy re-encryption schemes. They claimed that their schemes were chosen-ciphertext secure in the standard model. However, we find that the original ciphertext in their schemes are malleable. Thus, we present some concrete attacks and indicate their schemes fail to achieve chosen-ciphertext security in the standard model. (C) 2016 Published by Elsevier B.V.

关键词： conditional proxy re-encryption Identity-based Single hop Multi-hop Chosen-ciphertext security

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A New Kind of conditional proxy re-encryption for Secure Cloud Storage

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IEEE ACCESS 2018年 6卷 70017-70024页

作者： Zeng, Peng Choo, Kim-Kwang Raymond East China Normal Univ Shanghai Key Lab Trustworthy Comp Shanghai 200062 Peoples R China Univ Texas San Antonio Dept Informat Syst & Cyber Secur San Antonio TX 78249 USA Univ Texas San Antonio Dept Elect & Comp Engn San Antonio TX 78249 USA

Secure cloud storage has important applications in our big data-driven society, and to achieve secure cloud storage, we need to enforce strong access control mechanism. proxy re-encryption (Pre) has been shown to be an effective tool of constructing cryptographically enforced access control schemes. In a traditional Pre scheme, a semi-trusted proxy can convert all ciphertexts for a delegator to cipher-texts for a delegatee once the proxy obtains the relevant re-encryption key from the delegator. In many practical applications, however, a fine-grained delegation of decryption abilities may be demanded, and thus, the notion of conditional Pre (C-Pre) is introduced, which allows only the ciphertexts satisfying a concrete condition to be converted by the proxy. In this paper, we introduce a special kind of C-Pre, sender-specified Pre (SS-Pre), which enables the delegator to delegate the decryption right of the ciphertexts from a specified sender to his/her delegatee. We give a formal definition of SS-Pre and its security model. We also provide the concrete constructions of an IND-CPA secure SS-Pre scheme and an IND-CCA secure SS-Pre scheme with the properties of unidirectionality and single-use and prove the security of both schemes in the standard model. The detailed analysis shows that our new IND-CCA secure SS-Pre scheme achieves a higher efficiency in computation cost and ciphertext size than the conventional C-Pre schemes.

关键词： Secure cloud storage conditional proxy re-encryption sender-specified proxy re-encryption IND-CPA IND-CCA

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Interactive conditional proxy re-encryption with fine grain policy

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JOURNAL OF SYSTEMS AND SOFTWAre 2011年第12期84卷 2293-2302页

作者： Fang, Liming Susilo, Willy Ge, Chunpeng Wang, Jiandong Univ Wollongong Sch Comp Sci & Software Engn CCISR Wollongong NSW 2522 Australia Nanjing Univ Aeronaut & Astronaut Coll Informat Sci & Technol Nanjing 210016 Peoples R China

conditional proxy re-encryption (C-Pre) allows a semi-trusted proxy to convert a ciphertext satisfying one conditional set by sender into an encryption of the same message intended for a different recipient than the one that was originally intended to. In ISC 2009, Weng, Yang, Tang, Deng, and Bao proposed an efficient CCA secure C-Pre scheme, and left an open problem on how to construct CCA-secure C-Pre schemes supporting "OR" and "AND" gates over conditions. In this paper, we made the first attempt in constructing C-Pre schemes with richer policy, and hence addressing the problem raised by Weng et al. Nevertheless, our scheme is an interactive scheme. The 'interactive setting' used in our scheme refers to the case where the re-encryption key generation algorithm requires the involvement of the private key of the delegator and delegatee. As a consequence, we call our new cryptographic primitive as interactive conditional proxy re-encryption with fine grain policy (ICPre-FG). This notion basically enhances the notion of Pre by enabling the features from the attribute-based encryption (ABE). That means, our ICPre-FG has been constructed from a careful combination of the existing Pre and ABE techniques. In an ICPre-FG system, each ciphertext is labeled by the delegator with a set of descriptive conditions and each re-encryption key is associated with an access tree that specifies which type of ciphertexts the key can re-encrypt. We formalize the security model of ICPre-FG, and then we present a new and efficient construction of ICPre-FG scheme with CCA-security under the well-studied assumption in the random oracle model. (C) 2011 Elsevier Inc. All rights reserved.

关键词： conditional proxy re-encryption Attribute-based encryption Chosen-ciphertext security

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Efficient and Fully CCA Secure conditional proxy re-encryption from Hierarchical Identity-Based encryption

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COMPUTER JOURNAL 2015年第10期58卷 2778-2792页

作者： Liang, Kaitai Susilo, Willy Liu, Joseph K. Wong, Duncan S. Aalto Univ Dept Comp Sci Espoo Finland Univ Wollongong Sch Comp & Informat Technol Ctr Comp & Informat Secur Res Wollongong NSW 2522 Australia Monash Univ Fac Informat Technol Melbourne Vic 3004 Australia ASTRI Secur & Data Sci Hong Kong Hong Kong Peoples R China

A proxy re-encryption (Pre) allows a data owner to delegate the decryption rights of some encrypted data stored on the cloud without revealing the data to an honest-but-curious cloud service provider (i.e. the Pre proxy). Furthermore, the data owner can offload most of the computational operations to the cloud service provider and hence, using Pre for encrypted cloud data sharing can be very effective even for data owners using limited resource devices (e.g. mobile devices). However, Pre schemes only enables data owners to delegate the decryption rights of all their encrypted data. A more practical notion is a conditional Pre (CPre) that allows us to specify under what condition the decryption of an encrypted data can be delegated, for example, only sharing all the encrypted files under a directory called 'public'. In this paper, we provide an affirmative result on the long-standing question of building a full chosen-ciphertext attacks (CCA)-secure CPre system in the standard model and for the first time, we show that a class of Hierarchical Identity-Based encryption (HIBE) schemes can be transferred to building a CCA-secure CPre in the standard model. We also list out some concrete HIBE schemes which fall into this class, e.g., Lewko-Waters HIBE. All existing CCA-secure Pre schemes in the standard model are not conditional while all existing CPre schemes are either not CCA secure or not in the standard model. By instantiating our generic HIBE-based transformation, we show that an efficient and concrete CPre scheme which is both CCA secure in the standard model and conditional can be built.

关键词： conditional proxy re-encryption hierarchical identity-based encryption chosen-ciphertext security

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Chosen-ciphertext secure anonymous conditional proxy re-encryption with keyword search

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THEOreTICAL COMPUTER SCIENCE 2012年 462卷 39-58页

作者： Fang, Liming Susilo, Willy Ge, Chunpeng Wang, Jiandong Univ Wollongong Sch Comp Sci & Software Engn Ctr Comp & Informat Secur Res Wollongong NSW 2522 Australia Nanjing Univ Aeronaut & Astronaut Coll Comp Sci & Technol Nanjing Jiangsu Peoples R China

Weng et al. introduced the notion of conditional proxy re-encryption (or C-Pre, for short), whereby only the ciphertext satisfying one condition set by the delegator can be transformed by the proxy and then decrypted by delegatee. Nonetheless, they left an open problem on how to construct CCA-secure C-Pre schemes with anonymity. Fang et al. answered this question by presenting a construction of anonymous conditional proxy re-encryption (C-Pre) scheme without requiring random oracle. Nevertheless, Fang et al.'s scheme only satisfies the RCCA-security (which is a weaker variant of CCA-security assuming a harmless mauling of the challenge ciphertext is tolerated). Hence, it remains an open problem whether CCA-secure C-Pre schemes that satisfy both anonymity and full CCA-security can really be realized. Shao et al. introduced a new cryptographic primitive, called proxy re-encryption with keyword search (PreS), which is a combination of Pre and public key encryption with keyword search (PEKS), and they left an open problem on how to design an efficient unidirectional PreS scheme. In this paper, we answer the above open problems by proposing a new cryptographic primitive called conditional proxy re-encryption with keyword search (C-PreS), which combines C-Pre and PEKS. We note that there are subtleties in combining these two notions to achieve a secure scheme, and hence, the combination is not trivial. We propose a definition of security against chosen ciphertext attacks for C-PreS schemes with keyword anonymity, and thereafter present a scheme that satisfies the definition. The performance of our scheme outperforms Weng et al.'s construction, which has been regarded as the most efficient C-Pre scheme to date. (C) 2012 Elsevier B.V. All rights reserved.

关键词： Public key encryption conditional proxy re-encryption Keyword search Anonymity Chosen-ciphertext security

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PreCISE: Identity-based private data sharing with conditional proxy re-encryption in online social networks

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FUTUre GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF ESCIENCE 2018年 86卷 1523-1533页

作者： Huang, Qinlong Yang, Yixian Fu, Jingyi Beijing Univ Posts & Telecommun Informat Secur Ctr State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China Beijing Univ Posts & Telecommun Natl Engn Lab Disaster Backup & Recovery Beijing 100876 Peoples R China

Online social networks (OSNs) have become popular around the world due to its openness. Although cryptographic techniques can provide privacy protection for users in OSNs, several issues also remain problematic, such as fine-grained access control, efficiency and usability. In this paper, we propose PreCISE, an identity-based private data sharing scheme in OSNs with big data, in which the data owner could broadcast private data to a group of users at one time in a convenient and secure way. In order to achieve secure and fine-grained data disseminating in OSNs, we adopt attribute-based conditional proxy re-encryption to guarantee that only the data disseminators whose attributes satisfy access policy can disseminate the data to their own social space. The re-encryption key is associated with a set of attributes such that only the matched ciphertexts can be re-encrypted, which allows data owner to enforce access control over the disseminated ciphertexts in a fine-grained manner. The secure and performance analysis shows our scheme is secure and efficient. (C) 2017 Elsevier B.V. All rights reserved.

关键词： Data sharing Online social networks Identity-based broadcast encryption conditional proxy re-encryption Attribute-based encryption

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