Searchable public key encryption is a useful cryptographic paradigm that enables an untrustworthy server to retrieve the encrypted data without revealing the contents of the data. It offers a promising solution to enc...Searchable public key encryption is a useful cryptographic paradigm that enables an untrustworthy server to retrieve the encrypted data without revealing the contents of the data. It offers a promising solution to encrypted data retrieval in cryptographic cloud storage. Certificateless public key cryptography (CLPKC) is a novel cryptographic primitive that has many merits. It overcomes the key escrow problem in identity-based cryptography (IBC) and the cumbersome certificate problem in conventional public key cryptography (PKC). Motivated by the appealing features of CLPKC, several certificateless encryption with keyword search (CLEKS) schemes have been presented in the literature. But, our cryptanalysis demonstrates that the previously proposed CLEKS frameworks suffer from the security vulnerability caused by the keyword guessing attack. To remedy the security weakness in the previous frameworks and provide resistance against both inside and outside keyword guessing attacks, we propose a new CLEKS framework. Under the new framework, we design a concrete CLEKS scheme and formally prove its security in the random oracle model. Compared with previous two CLEKS schemes, the proposed scheme has better overall performance while offering stronger security guarantee as it withstands the existing known types of keyword guessing attacks.展开更多
Brenda Linson never goes anywhere without an empty spectaclescase. It is as vital to her as her purse. Yet, she doesn’twear glasses. The reason she can’t do without it is because shecan’t read and she can’t write....Brenda Linson never goes anywhere without an empty spectaclescase. It is as vital to her as her purse. Yet, she doesn’twear glasses. The reason she can’t do without it is because shecan’t read and she can’t write. If ever she gets into any situationwhere she might be expected to do either of these things, shefishes around in her bag for the specs case, finds it’s empty,展开更多
研究了最优化理论与方法在摄像机标定中的应用,并以两步法的第二步为例,详细介绍了如何根据最小化重投影误差这一非线性最小二乘问题求出所有标定参数的最优解,给出了用G uses-N ew ton法进行求解的具体步骤,并在M atlab下实现对一组初...研究了最优化理论与方法在摄像机标定中的应用,并以两步法的第二步为例,详细介绍了如何根据最小化重投影误差这一非线性最小二乘问题求出所有标定参数的最优解,给出了用G uses-N ew ton法进行求解的具体步骤,并在M atlab下实现对一组初始数据的迭代优化。展开更多
针对不同医疗机构之间电子病历(Electronic Medical Record,EMR)数据共享困难、患者隐私泄露的问题,提出一种基于区块链与可搜索加密的电子病历共享方案。该方案利用区块链技术,结合基于身份的加密与代理重加密,实现云服务器中EMR的密...针对不同医疗机构之间电子病历(Electronic Medical Record,EMR)数据共享困难、患者隐私泄露的问题,提出一种基于区块链与可搜索加密的电子病历共享方案。该方案利用区块链技术,结合基于身份的加密与代理重加密,实现云服务器中EMR的密态检索,从而确保检索结果的完整正确性。安全性分析结果表明,所提方案具有关键词密文不可区分性、陷门不可区分性和可抵御内部关键词猜测攻击的隐私安全特性。仿真结果表明,所提方案具有较高的EMR关键字密文检索效率。展开更多
基金supported by the National Natural Science Foundation of China under Grant Nos. 61772009 and U1736112the Natural Science Foundation of Jiangsu Province under Grant Nos. BK20161511 and BK20181304
文摘Searchable public key encryption is a useful cryptographic paradigm that enables an untrustworthy server to retrieve the encrypted data without revealing the contents of the data. It offers a promising solution to encrypted data retrieval in cryptographic cloud storage. Certificateless public key cryptography (CLPKC) is a novel cryptographic primitive that has many merits. It overcomes the key escrow problem in identity-based cryptography (IBC) and the cumbersome certificate problem in conventional public key cryptography (PKC). Motivated by the appealing features of CLPKC, several certificateless encryption with keyword search (CLEKS) schemes have been presented in the literature. But, our cryptanalysis demonstrates that the previously proposed CLEKS frameworks suffer from the security vulnerability caused by the keyword guessing attack. To remedy the security weakness in the previous frameworks and provide resistance against both inside and outside keyword guessing attacks, we propose a new CLEKS framework. Under the new framework, we design a concrete CLEKS scheme and formally prove its security in the random oracle model. Compared with previous two CLEKS schemes, the proposed scheme has better overall performance while offering stronger security guarantee as it withstands the existing known types of keyword guessing attacks.
文摘Brenda Linson never goes anywhere without an empty spectaclescase. It is as vital to her as her purse. Yet, she doesn’twear glasses. The reason she can’t do without it is because shecan’t read and she can’t write. If ever she gets into any situationwhere she might be expected to do either of these things, shefishes around in her bag for the specs case, finds it’s empty,
文摘针对不同医疗机构之间电子病历(Electronic Medical Record,EMR)数据共享困难、患者隐私泄露的问题,提出一种基于区块链与可搜索加密的电子病历共享方案。该方案利用区块链技术,结合基于身份的加密与代理重加密,实现云服务器中EMR的密态检索,从而确保检索结果的完整正确性。安全性分析结果表明,所提方案具有关键词密文不可区分性、陷门不可区分性和可抵御内部关键词猜测攻击的隐私安全特性。仿真结果表明,所提方案具有较高的EMR关键字密文检索效率。
