基于以太坊的格上属性基可搜索加密方案

提出了一种基于以太坊的安全、灵活、高效的格上属性基可搜索加密方案.方案基于格密码体制提出,解决了传统基于双线性配对技术的属性基可搜索加密方案存在的不可抗量子攻击安全问题.方案使用基于以太坊技术的分散存储方法解决了传统云存储系统中单点故障问题,并且方案中数据拥有者代替私钥生成器为用户生成私钥,这避免传统方案由于密钥托管问题造成的密钥滥用以及隐私泄露.采用以太坊的智能合约解决了以往属性基可搜索加密方案中云服务提供商不可信情况下关键字搜索结果的可靠性问题.与传统属性基可搜索加密方案相比,方案不仅可实现对加密关键字的细粒度检索,并且可抵抗量子攻击,增强了方案的安全性.在容错学习问题(learning with errors,LWE)假设下,证明了方案的安全性.

Attribute-based searchable encryption scheme from lattices on Ethereum

A secure, flexible and efficient attribute-based searchable encryption scheme from lattices on Ethereum is proposed. The scheme solves the security problem of irresistible quantum attacks existing in traditional attribute-based searchable encryption schemes based on bilinear pairing technology. The solution uses a distributed storage method based on Ethereum technology to solve the problem of single point failure in the traditional cloud storage system, and the data owner in the solution replaces the private key generator to generate private key for user, avoiding the key abuse and privacy leakage caused by the key escrow problem in the traditional solution. The use of Ethereum''s smart contracts solves the reliability of keyword search results in the past when the cloud service provider was not trusted. Compared with the traditional attribute-based searchable encryption schemes, this scheme can not only achieve fine-grained retrieval of encrypted keywords, but also resist quantum attacks and enhance the security of the scheme. Under the assumption of LWE (Learning with Errors), the security of the scheme is proved.