由于在数据库服务(Database as a Service,DaaS)模式下,数据库服务提供者是半可信的(Honest-But-Curious),因此,为了保证外包数据的机密性和安全可查询,数据拥有者通常采用特定的加密技术加密外包数据,如采用可搜索加密技术、同态加密...由于在数据库服务(Database as a Service,DaaS)模式下,数据库服务提供者是半可信的(Honest-But-Curious),因此,为了保证外包数据的机密性和安全可查询,数据拥有者通常采用特定的加密技术加密外包数据,如采用可搜索加密技术、同态加密技术等实现外包加密数据上的安全查询.然而,且当前提出的大多数方法都基于关键字精确匹配查询,即使存在少量针对加密数据上的模糊查询,也在查询效率、存储开销和安全性方面存在一定的局限性,不适用于DaaS数据库服务模式.文中首次提出了融合具有高编码效率的Huffman编码和具有数据存储优势的布鲁姆过滤器,并结合现有的安全加密方法,实现了DaaS模式下保护隐私的模糊关键字查询处理.一方面,基于Huffman编码的树型索引提供了较高的查找效率;另一方面,基于布鲁姆过滤器的模糊关键字集合实现了较小的存储开销.安全分析、性能分析以及真实论文集上的实验结果进一步验证了文中查询算法的安全性、存储开销和查询效率.展开更多
This paper presents a Dietary Analysis and Advice System (DAAS), a web based system for providing, within the public healthcare domain, user specific diet advice based on a preliminary analysis of current diet or eati...This paper presents a Dietary Analysis and Advice System (DAAS), a web based system for providing, within the public healthcare domain, user specific diet advice based on a preliminary analysis of current diet or eating habits and lifestyle, using knowledge from domain expertise and experts’ interpretation of national dietary guidelines.展开更多
In a database-as-a-service(DaaS)model,a data owner stores data in a database server of a service provider,and the DaaS adopts the encryption for data privacy and indexing for data query.However,an attacker can obtain ...In a database-as-a-service(DaaS)model,a data owner stores data in a database server of a service provider,and the DaaS adopts the encryption for data privacy and indexing for data query.However,an attacker can obtain original data’s statistical information and distribution via the indexing distribution from the database of the service provider.In this work,a novel indexing schema is proposed to satisfy privacy-preserved data management requirements,in which an attacker cannot obtain data source distribution or statistic information from the index.The approach includes 2 parts:the Hash-based indexing for encrypted data and correctness verification for range queries.The evaluation results demonstrate that the approach can hide statistical information of encrypted data distribution while can also obtain correct answers for range queries.Meanwhile,the approach can achieve nearly 10 times and 35 times improvement on encrypted data publishing and indexing respectively,compared with the start-of-the-art method order-preserving Hash-based function(OPHF).展开更多
文摘由于在数据库服务(Database as a Service,DaaS)模式下,数据库服务提供者是半可信的(Honest-But-Curious),因此,为了保证外包数据的机密性和安全可查询,数据拥有者通常采用特定的加密技术加密外包数据,如采用可搜索加密技术、同态加密技术等实现外包加密数据上的安全查询.然而,且当前提出的大多数方法都基于关键字精确匹配查询,即使存在少量针对加密数据上的模糊查询,也在查询效率、存储开销和安全性方面存在一定的局限性,不适用于DaaS数据库服务模式.文中首次提出了融合具有高编码效率的Huffman编码和具有数据存储优势的布鲁姆过滤器,并结合现有的安全加密方法,实现了DaaS模式下保护隐私的模糊关键字查询处理.一方面,基于Huffman编码的树型索引提供了较高的查找效率;另一方面,基于布鲁姆过滤器的模糊关键字集合实现了较小的存储开销.安全分析、性能分析以及真实论文集上的实验结果进一步验证了文中查询算法的安全性、存储开销和查询效率.
文摘This paper presents a Dietary Analysis and Advice System (DAAS), a web based system for providing, within the public healthcare domain, user specific diet advice based on a preliminary analysis of current diet or eating habits and lifestyle, using knowledge from domain expertise and experts’ interpretation of national dietary guidelines.
基金the National Natural Science Foundation of China(No.61931019).
文摘In a database-as-a-service(DaaS)model,a data owner stores data in a database server of a service provider,and the DaaS adopts the encryption for data privacy and indexing for data query.However,an attacker can obtain original data’s statistical information and distribution via the indexing distribution from the database of the service provider.In this work,a novel indexing schema is proposed to satisfy privacy-preserved data management requirements,in which an attacker cannot obtain data source distribution or statistic information from the index.The approach includes 2 parts:the Hash-based indexing for encrypted data and correctness verification for range queries.The evaluation results demonstrate that the approach can hide statistical information of encrypted data distribution while can also obtain correct answers for range queries.Meanwhile,the approach can achieve nearly 10 times and 35 times improvement on encrypted data publishing and indexing respectively,compared with the start-of-the-art method order-preserving Hash-based function(OPHF).
