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 attribu...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 delegation.By introducing the concept of weight attributes,the quantity of system attributes managed by the server is reduced greatly.At the same time,a weighted tree structure is constructed to simplify the expression of access structure effectively.With 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 costs.The 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.展开更多
Wireless sensor networks(WSNs)have become increasingly popular due to the rapid growth of the Internet of Things.As open wireless transmission media are easy to attack,security is one of the primary design concerns fo...Wireless sensor networks(WSNs)have become increasingly popular due to the rapid growth of the Internet of Things.As open wireless transmission media are easy to attack,security is one of the primary design concerns for WSNs.Current solutions consider routing and data encryption as two isolated issues,providing incomplete security.Therefore,in this paper,we divide the WSN communication process into a data path selection phase and a data encryption phase.We propose an improved transmission method based on ant colony optimization(ACO)and threshold proxy re-encryption for WSNs,and we named it as ACOTPRE.The method resists internal and external attacks and ensures safe and efficient data transmission.In the data path selection stage,the ACO algorithm is used for network routing.The improvement of the pheromone concentration is proposed.In order to resist attacks from external attackers,proxy re-encryption is extended to WSN in the data encryption stage.The threshold secret sharing algorithm is introduced to generate a set of re-encryption key fragments composed of random numbers at the source node.We confirm the performance of our model via simulation studies.展开更多
Threshold proxy re-encryption(TPRE)can prevent collusion between a single proxy and a delegatee from converting arbitrary files against the wishes of the delegator through multiple proxies,and can also provide normal ...Threshold proxy re-encryption(TPRE)can prevent collusion between a single proxy and a delegatee from converting arbitrary files against the wishes of the delegator through multiple proxies,and can also provide normal services even when certain proxy servers are paralyzed or damaged.A non-interactive identity-based TPRE(IB-TPRE)scheme over lattices is proposed which removes the public key certificates.To accomplish this scheme,Shamir’s secret sharing is employed twice,which not only effectively hides the delegator’s private key information,but also decentralizes the proxy power by splitting the re-encryption key.Robustness means that a combiner can detect a misbehaving proxy server that has sent an invalid transformed ciphertext share.This property is achieved by lattice-based fully homomorphic signatures.As a result,the whole scheme is thoroughly capable of resisting quantum attacks even when they are available.The security of the proposed scheme is based on the decisional learning with error hardness assumption in the standard model.Two typical application scenarios,including a file-sharing system based on a blockchain network and a robust key escrow system with threshold cryptography,are presented.展开更多
With the massive diffusion of cloud computing, more and more sensitive data is being centralized into the cloud for sharing, which brings forth new challenges for the security and privacy of outsourced data. To addres...With the massive diffusion of cloud computing, more and more sensitive data is being centralized into the cloud for sharing, which brings forth new challenges for the security and privacy of outsourced data. To address these challenges, the server-aided access control(SAAC) system was proposed. The SAAC system builds upon a variant of conditional proxy re-encryption(CPRE) named threshold conditional proxy re-encryption(TCPRE). In TCPRE, t out of n proxies can re-encrypt ciphertexts(satisfying some specified conditions) for the delegator(while up to t-1 proxies cannot), and the correctness of the re-encrypted ciphertexts can be publicly verified. Both features guarantee the trust and reliability on the proxies deployed in the SAAC system. The security models for TCPRE were formalized, several TCPRE constructions were proposed and that our final scheme was secure against chosen-ciphertext attacks was proved.展开更多
The sharing of pathological data is highly important in various applications,such as remote diagnosis,graded diagnosis,illness treatment,and specialist system development.However,ensuring reliable,secure,privacy-prese...The sharing of pathological data is highly important in various applications,such as remote diagnosis,graded diagnosis,illness treatment,and specialist system development.However,ensuring reliable,secure,privacy-preserving,and efficient sharing of pathological data poses significant challenges.This paper presents a novel solution that leverages blockchain technology to ensure reliability in pathological data sharing.Additionally,it employs conditional proxy re-encryption(C-PRE)and public key encryption with equality test technology to control the scope and preserve the privacy of shared data.To assess the practicality of our solution,we implemented a prototype system using Hyperledger Fabric and conducted evaluations with various metrics.We also compared the solution with relevant schemes.The results demonstrate that the proposed solution effectively meets the requirements for pathological data sharing and is practical in production scenarios.展开更多
基金Programs for Science and Technology Development of Henan Province,grant number 242102210152The Fundamental Research Funds for the Universities of Henan Province,grant number NSFRF240620+1 种基金Key Scientific Research Project of Henan Higher Education Institutions,grant number 24A520015Henan Key Laboratory of Network Cryptography Technology,grant number LNCT2022-A11.
文摘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 delegation.By introducing the concept of weight attributes,the quantity of system attributes managed by the server is reduced greatly.At the same time,a weighted tree structure is constructed to simplify the expression of access structure effectively.With 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 costs.The 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.
基金This work was supported in part by Beijing Municipal Natural Science Foundation(19L2020)National Key Research and Development Project(Key Technologies and Applications of Security and Trusted Industrial Control System NO.2020YFB2009500).
文摘Wireless sensor networks(WSNs)have become increasingly popular due to the rapid growth of the Internet of Things.As open wireless transmission media are easy to attack,security is one of the primary design concerns for WSNs.Current solutions consider routing and data encryption as two isolated issues,providing incomplete security.Therefore,in this paper,we divide the WSN communication process into a data path selection phase and a data encryption phase.We propose an improved transmission method based on ant colony optimization(ACO)and threshold proxy re-encryption for WSNs,and we named it as ACOTPRE.The method resists internal and external attacks and ensures safe and efficient data transmission.In the data path selection stage,the ACO algorithm is used for network routing.The improvement of the pheromone concentration is proposed.In order to resist attacks from external attackers,proxy re-encryption is extended to WSN in the data encryption stage.The threshold secret sharing algorithm is introduced to generate a set of re-encryption key fragments composed of random numbers at the source node.We confirm the performance of our model via simulation studies.
基金Project supported by the National Natural Science Foundation of China(Nos.U1636114,61572521,and 61772550)the Innovative Research Team in Engineering University of People’s Armed Police,China(No.KYTD201805)+1 种基金the Natural Science Foundation of Shaanxi Province,China(No.2021JM-252)the Basic Research Project of Engineering University of People’s Armed Police,China(No.WJY201914)。
文摘Threshold proxy re-encryption(TPRE)can prevent collusion between a single proxy and a delegatee from converting arbitrary files against the wishes of the delegator through multiple proxies,and can also provide normal services even when certain proxy servers are paralyzed or damaged.A non-interactive identity-based TPRE(IB-TPRE)scheme over lattices is proposed which removes the public key certificates.To accomplish this scheme,Shamir’s secret sharing is employed twice,which not only effectively hides the delegator’s private key information,but also decentralizes the proxy power by splitting the re-encryption key.Robustness means that a combiner can detect a misbehaving proxy server that has sent an invalid transformed ciphertext share.This property is achieved by lattice-based fully homomorphic signatures.As a result,the whole scheme is thoroughly capable of resisting quantum attacks even when they are available.The security of the proposed scheme is based on the decisional learning with error hardness assumption in the standard model.Two typical application scenarios,including a file-sharing system based on a blockchain network and a robust key escrow system with threshold cryptography,are presented.
基金The National Natural Science Foundation of China(No.61272413,No.61472165)
文摘With the massive diffusion of cloud computing, more and more sensitive data is being centralized into the cloud for sharing, which brings forth new challenges for the security and privacy of outsourced data. To address these challenges, the server-aided access control(SAAC) system was proposed. The SAAC system builds upon a variant of conditional proxy re-encryption(CPRE) named threshold conditional proxy re-encryption(TCPRE). In TCPRE, t out of n proxies can re-encrypt ciphertexts(satisfying some specified conditions) for the delegator(while up to t-1 proxies cannot), and the correctness of the re-encrypted ciphertexts can be publicly verified. Both features guarantee the trust and reliability on the proxies deployed in the SAAC system. The security models for TCPRE were formalized, several TCPRE constructions were proposed and that our final scheme was secure against chosen-ciphertext attacks was proved.
基金supported by National Natural Science Foundation of China under Grant 61972438Wuhu Science and Tech-nology Plan Project under Grant 2022yf50Key Research and Develop-ment Projects in Anhui Province under Grant 202004a05020002 and 2022a05020049.
文摘The sharing of pathological data is highly important in various applications,such as remote diagnosis,graded diagnosis,illness treatment,and specialist system development.However,ensuring reliable,secure,privacy-preserving,and efficient sharing of pathological data poses significant challenges.This paper presents a novel solution that leverages blockchain technology to ensure reliability in pathological data sharing.Additionally,it employs conditional proxy re-encryption(C-PRE)and public key encryption with equality test technology to control the scope and preserve the privacy of shared data.To assess the practicality of our solution,we implemented a prototype system using Hyperledger Fabric and conducted evaluations with various metrics.We also compared the solution with relevant schemes.The results demonstrate that the proposed solution effectively meets the requirements for pathological data sharing and is practical in production scenarios.
