标准模型下格上抗合谋攻击安全的代理重加密方案  

Identity Based Collusion Resistant Proxy Re-encryption Scheme from Lattices under the Standard Model

作　　者：吴立强 

机构地区：[1]武警工程大学电子技术系,西安710086

出　　处：《科学技术与工程》2017年第16期93-99,共7页Science Technology and Engineering

基　　金：国家自然科学基金项目(61272492);武警工程大学基础研究项目(WJY201523)资助

摘　　要：随机预言模型下安全的密码方案并不能保证在现实世界中的安全性,而构造标准模型下、基于格上困难问题,可抗合谋攻击的身份型代理重加密方案一直是密码学界的研究热点。通过采用陷门产生函数、左右抽样、bit分解等技术,设计了一个抗合谋攻击安全的基于身份代理重加密方案。在标准模型下,将该方案的安全性规约为判定性LWE(learning with errors)困难假设,证明了其能够达到IND-Pr ID-CPA安全,并对单向、多跳和抗合谋攻击等性质进行了分析。The secure encryption schemes under the random oracle model can＇t be guaranteed their security in the real world,therefore,it has been a hot research topic to build a collusion resistant identity based proxy reencryption scheme from lattices under the standard model. Based on the technologies of trap-generation function,left and right sampling and bit decomposition,a secure proxy re-encryption scheme with anti-collusion attack is designed under the standard model,whose security is proved to be based on LWE（ learning with errors） hard assumption and can achieve IND-Pr ID-CPA security,in addition,the properties of unidirection,multi-hop and collusion-resistant security and other properties are also analyzed.

关 键 词：格 代理重加密 标准模型 合谋攻击安全 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]