有效的标准模型下格上基于身份的代理重加密  

Efficient Identity-based Proxy Re-encryption on Lattice in the Standard Model

作　　者：江明明 郭宇燕 余磊[1] 宋万干[1] 魏仕民[1] JIANG Mingming;GUO Yuyan;YU Lei;SONG Wangan;WEI Shimin(School of Computer Science and Technology,Huaibei Normal University,Huaibei 235000,China)

机构地区：[1]淮北师范大学计算机科学与技术学院,淮北235000

出　　处：《电子与信息学报》2019年第1期61-66,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(60573026);安徽省自然科学基金(1708085QF154);安徽省高校自然科学基金(KJ2016A627;KJ2018A0398;KJ2017ZD32);安徽省高校人才计划项目(gxyq2017154)~~

摘　　要：代理重加密在云计算环境下的密文共享等方面起着重要的作用。目前格上基于身份的代理重加密方案都是随机预言机模型的。针对这个问题,该文构造了一个高效的标准模型下格上基于身份的代理重加密方案。在方案中,用户身份仅仅被映射为一个向量,使得用户私钥的尺寸较短。该方案具有双向性,多次使用性等性质,并且在LWE困难假设下是适应性选择身份CPA安全的。Proxy re-encryption plays an important role for encrypted data sharing and so on in cloud computing.Currently,almost all of the constructions of identity-based proxy re-encryption over lattice are in the random oracle model.According to this problem,an efficient identity-based proxy re-encryption is constructed over lattice in the standard model,where the identity string is just mapped to one vector and getting a shorter secret key for users.The proposed scheme has the properties of bidirectional,multi-use,moreover,it is semantic secure against adaptive chosen identity and chosen plaintext attack based on Learning With Errors(LWE)problems in the standard mode.

关 键 词：代理重加密 格密码 高斯抽样 基于身份的密码学 

分 类 号：TN918.4[电子电信—通信与信息系统]