The mushroom growth of IoT has been accompanied by the generation of massive amounts of data.Subject to the limited storage and computing capabilities ofmost IoT devices,a growing number of institutions and organizati...The mushroom growth of IoT has been accompanied by the generation of massive amounts of data.Subject to the limited storage and computing capabilities ofmost IoT devices,a growing number of institutions and organizations outsource their data computing tasks to cloud servers to obtain efficient and accurate computation while avoiding the cost of local data computing.One of the most important challenges facing outsourcing computing is how to ensure the correctness of computation results.Linearly homomorphic proxy signature(LHPS)is a desirable solution to ensure the reliability of outsourcing computing in the case of authorized signing right.Blockchain has the characteristics of tamper-proof and traceability,and is a new technology to solve data security.However,as far as we know,constructions of LHPS have been few and far between.In addition,the existing LHPS scheme does not focus on homomorphic unforgeability and does not use blockchain technology.Herein,we improve the security model of the LHPS scheme,and the usual existential forgery and homomorphic existential forgery of two types of adversaries are considered.Under the new model,we present a blockchain-based LHPS scheme.The security analysis shows that under the adaptive chosen message attack,the unforgeability of the proposed scheme can be reduced to the CDH hard assumption,while achieving the usual and homomorphic existential unforgeability.Moreover,comparedwith the previous LHPS scheme,the performance analysis shows that our scheme has the same key size and comparable computational overhead,but has higher security.展开更多
With the development of Internet of Things technology,intelligent door lock devices are widely used in the field of house leasing.In the traditional housing leasing scenario,problems of door lock information disclosur...With the development of Internet of Things technology,intelligent door lock devices are widely used in the field of house leasing.In the traditional housing leasing scenario,problems of door lock information disclosure,tenant privacy disclosure and rental contract disputes frequently occur,and the security,fairness and auditability of the housing leasing transaction cannot be guaranteed.To solve the above problems,a blockchain-based proxy re-encryption scheme with conditional privacy protection and auditability is proposed.The scheme implements fine-grained access control of door lock data based on attribute encryption technology with policy hiding,and uses proxy re-encryption technology to achieve auditable supervision of door lock information transactions.Homomorphic encryption technology and zero-knowledge proof technology are introduced to ensure the confidentiality of housing rent information and the fairness of rent payment.To construct a decentralized housing lease transaction architecture,the scheme realizes the efficient collaboration between the door lock data ciphertext stored under the chain and the key information ciphertext on the chain based on the blockchain and InterPlanetary File System.Finally,the security proof and computing performance analysis of the proposed scheme are carried out.The results show that the scheme can resist the chosen plaintext attack and has low computational cost.展开更多
代理重加密能够实现解密权限的转换,而鲁棒门限代理重加密(Threshold Proxy Re-Encryption,TPRE)不仅支持安全灵活的转化控制,而且支持转化密文的合法性验证.本文利用理想格上工具构造了一种TPRE方案,采用Shamir秘密共享实现门限控制,...代理重加密能够实现解密权限的转换,而鲁棒门限代理重加密(Threshold Proxy Re-Encryption,TPRE)不仅支持安全灵活的转化控制,而且支持转化密文的合法性验证.本文利用理想格上工具构造了一种TPRE方案,采用Shamir秘密共享实现门限控制,采用格上同态签名技术实现鲁棒性,可完全抗量子攻击.新方案与标准格上方案相比,密文尺寸小、密钥份额短、计算速度快;基于PRE和TPRE安全模型的差异,证明对TPRE的攻击多项式时间内可转化为对基础PRE方案的攻击,安全性可规约为R-LWE(Learning With Errors over Ring)困难假设;新方案适用于在去中心化环境中实现密文访问控制,可用于基于区块链网络的文件共享和多域网络快速互联等场景.展开更多
Cloud computing provides a convenient way of content trading and sharing. In this paper, we propose a secure and privacy-preserving digital rights management （DRM） scheme using homomorphic encryption in cloud comput...Cloud computing provides a convenient way of content trading and sharing. In this paper, we propose a secure and privacy-preserving digital rights management （DRM） scheme using homomorphic encryption in cloud computing. We present an efficient digital rights management framework in cloud computing, which allows content provider to outsource encrypted contents to centralized content server and allows user to consume contents with the license issued by license server. Further, we provide a secure content key distribution scheme based on additive homomorphic probabilistic public key encryption and proxy re-encryption. The provided scheme prevents malicious employees of license server from issuing the license to unauthorized user. In addition, we achieve privacy preserving by allowing users to stay anonymous towards the key server and service provider. The analysis and comparison results indicate that the proposed scheme has high efficiency and security.展开更多
为解决云环境下多用户共享、隐私安全和密文计算等问题,该文提出一种适用于云环境的基于代理重加密的多用户全同态（proxy re-encryption-based,multi-user,fully homomorphic encryption scheme for cloud computing,PREBMUFHE）加密...为解决云环境下多用户共享、隐私安全和密文计算等问题,该文提出一种适用于云环境的基于代理重加密的多用户全同态（proxy re-encryption-based,multi-user,fully homomorphic encryption scheme for cloud computing,PREBMUFHE）加密方案。该方案使用不同的公钥对不同用户的密文进行加密,使得不同用户密文满足密文独立和不可区分性。为了使2个用户之间的密文运算结果满足全同态性,当密文上传到云端时,由云服务提供商（cloud service provider,CPS）作为代理方对其中一个用户的密文进行重加密,将其转化为对同一用户下的密文,然后再进行密文的运算。安全分析证明了该方案的安全性是基于容错学习（learning with errors,LWE）困难问题,在普通双线性群随机域模型下能抵御选择明文攻击（indistinguishability under chosen plaintext attack,IND-CPA）。实验结果表明：该方案能有效实现不同用户密文的全同态运算,支持多用户共享。展开更多
基金funded by the Special Innovation Project forGeneral Colleges and Universities in Guangdong Province (Grant No.2020KTSCX126).
文摘The mushroom growth of IoT has been accompanied by the generation of massive amounts of data.Subject to the limited storage and computing capabilities ofmost IoT devices,a growing number of institutions and organizations outsource their data computing tasks to cloud servers to obtain efficient and accurate computation while avoiding the cost of local data computing.One of the most important challenges facing outsourcing computing is how to ensure the correctness of computation results.Linearly homomorphic proxy signature(LHPS)is a desirable solution to ensure the reliability of outsourcing computing in the case of authorized signing right.Blockchain has the characteristics of tamper-proof and traceability,and is a new technology to solve data security.However,as far as we know,constructions of LHPS have been few and far between.In addition,the existing LHPS scheme does not focus on homomorphic unforgeability and does not use blockchain technology.Herein,we improve the security model of the LHPS scheme,and the usual existential forgery and homomorphic existential forgery of two types of adversaries are considered.Under the new model,we present a blockchain-based LHPS scheme.The security analysis shows that under the adaptive chosen message attack,the unforgeability of the proposed scheme can be reduced to the CDH hard assumption,while achieving the usual and homomorphic existential unforgeability.Moreover,comparedwith the previous LHPS scheme,the performance analysis shows that our scheme has the same key size and comparable computational overhead,but has higher security.
基金supported by National Key Research and Development Project(No.2020YFB1005500)Beijing Natural Science Foundation Project(No.M21034)。
文摘With the development of Internet of Things technology,intelligent door lock devices are widely used in the field of house leasing.In the traditional housing leasing scenario,problems of door lock information disclosure,tenant privacy disclosure and rental contract disputes frequently occur,and the security,fairness and auditability of the housing leasing transaction cannot be guaranteed.To solve the above problems,a blockchain-based proxy re-encryption scheme with conditional privacy protection and auditability is proposed.The scheme implements fine-grained access control of door lock data based on attribute encryption technology with policy hiding,and uses proxy re-encryption technology to achieve auditable supervision of door lock information transactions.Homomorphic encryption technology and zero-knowledge proof technology are introduced to ensure the confidentiality of housing rent information and the fairness of rent payment.To construct a decentralized housing lease transaction architecture,the scheme realizes the efficient collaboration between the door lock data ciphertext stored under the chain and the key information ciphertext on the chain based on the blockchain and InterPlanetary File System.Finally,the security proof and computing performance analysis of the proposed scheme are carried out.The results show that the scheme can resist the chosen plaintext attack and has low computational cost.
文摘代理重加密能够实现解密权限的转换,而鲁棒门限代理重加密(Threshold Proxy Re-Encryption,TPRE)不仅支持安全灵活的转化控制,而且支持转化密文的合法性验证.本文利用理想格上工具构造了一种TPRE方案,采用Shamir秘密共享实现门限控制,采用格上同态签名技术实现鲁棒性,可完全抗量子攻击.新方案与标准格上方案相比,密文尺寸小、密钥份额短、计算速度快;基于PRE和TPRE安全模型的差异,证明对TPRE的攻击多项式时间内可转化为对基础PRE方案的攻击,安全性可规约为R-LWE(Learning With Errors over Ring)困难假设;新方案适用于在去中心化环境中实现密文访问控制,可用于基于区块链网络的文件共享和多域网络快速互联等场景.
基金supported by the National Natural Science Foundation of China (60803157, 90812001, 61272519)
文摘Cloud computing provides a convenient way of content trading and sharing. In this paper, we propose a secure and privacy-preserving digital rights management （DRM） scheme using homomorphic encryption in cloud computing. We present an efficient digital rights management framework in cloud computing, which allows content provider to outsource encrypted contents to centralized content server and allows user to consume contents with the license issued by license server. Further, we provide a secure content key distribution scheme based on additive homomorphic probabilistic public key encryption and proxy re-encryption. The provided scheme prevents malicious employees of license server from issuing the license to unauthorized user. In addition, we achieve privacy preserving by allowing users to stay anonymous towards the key server and service provider. The analysis and comparison results indicate that the proposed scheme has high efficiency and security.
文摘为解决云环境下多用户共享、隐私安全和密文计算等问题,该文提出一种适用于云环境的基于代理重加密的多用户全同态（proxy re-encryption-based,multi-user,fully homomorphic encryption scheme for cloud computing,PREBMUFHE）加密方案。该方案使用不同的公钥对不同用户的密文进行加密,使得不同用户密文满足密文独立和不可区分性。为了使2个用户之间的密文运算结果满足全同态性,当密文上传到云端时,由云服务提供商（cloud service provider,CPS）作为代理方对其中一个用户的密文进行重加密,将其转化为对同一用户下的密文,然后再进行密文的运算。安全分析证明了该方案的安全性是基于容错学习（learning with errors,LWE）困难问题,在普通双线性群随机域模型下能抵御选择明文攻击（indistinguishability under chosen plaintext attack,IND-CPA）。实验结果表明：该方案能有效实现不同用户密文的全同态运算,支持多用户共享。
