基于谓词的Paillier型密文解密外包方案  

Paillier Type Outsourcing the Decryption Ciphertexts via Predicate Encryption

作　　者：张薇 白平 李镇林 李聪 ZHANG Wei;BAI Ping;LI Zhenlin;LI Cong(College of Cryptographic Engineering,Engineering College of PAP,Xi′an 710086,China;Key Laboratory of Information Security,Engineering College of PAP,Xi′an 710086,China)

机构地区：[1]武警工程大学密码工程学院,陕西西安710086 [2]武警工程大学信息安全保密重点实验室,陕西西安710086

出　　处：《郑州大学学报（理学版）》2018年第3期7-14,共8页Journal of Zhengzhou University:Natural Science Edition

基　　金：国家密码发展基金项目(MMJJ20170112);陕西省自然科学基金项目(2016JQ6037)

摘　　要：近年来,随着云技术的快速发展,越来越多的用户开始将复杂的计算资源外包给"云端",然而,云环境下如何对数据进行访问控制却成为制约其发展的瓶颈.基于谓词的加密(predicate encryption,PE)方法计算更加复杂和灵活,从而能实现对密文解密权限的访问控制,因而备受关注.在Paillier方案基础上,借鉴Green等人提出的密文解密外包思想,构造了基于谓词的Paillier型密文解密外包方案.同时,解密过程被部分外包到"云端"进行,减小了用户开销.该方案支持同态操作,并且在子群判定问题困难假设下达到IND-AH-CPA(INDistinguishability-attribute hiding-chosen plain attack)安全.With the proliferation of computation and storage outsourcing,access control became one of the vital problems in cloud computing.Supporting more complex and flexible function,predicate encryption(PE)was gaining more and more attention in access control of decryption oursourcing.Based on the somewhat homomorphic encryption Paillier scheme and combined with Green′s scheme which supports outsourcing the decryption ciphertexts,a Paillier type outsourcing the decryption ciphertexts via predicate encryption was constructed.In this scheme,decryption could be outsourced to the cloud,and which could greatly reduce the storage and computation costs of user end.Moreover,the scheme supported arbitrary homomorphic addition and one homomorphic multiplication on ciphertexts.IND-AH-CPA security of the scheme was proved under subgroup decision assumption.

关 键 词：谓词加密 同态加密 外包计算 云计算 访问控制 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]