Key-Private Identity-Based Proxy Re-Encryption  

作　　者：Chunpeng Ge Jinyue Xia Liming Fang 

机构地区：[1]College of Computer Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing,210000,China [2]IBM,Research Triangle Park,North Carolina,27709,USA

出　　处：《Computers, Materials & Continua》2020年第5期633-647,共15页计算机、材料和连续体（英文）

基　　金：This work is supported by the National Natural Science Foundation of China(Nos.61702236,61672270,61602216,61872181);Changzhou Sci&Tech Program(Grant No.CJ20179027).

摘　　要：An identity-based proxy re-encryption scheme(IB-PRE)allows a semi-trusted proxy to convert an encryption under one identity to another without revealing the underlying message.Due to the fact that the proxy was semi-trusted,it should place as little trust as necessary to allow it to perform the translations.In some applications such as distributed file system,it demands the adversary cannot identify the sender and recipient’s identities.However,none of the exiting IB-PRE schemes satisfy this requirement.In this work,we first define the security model of key-private IB-PRE.Finally,we propose the first key-private IB-PRE scheme.Our scheme is chosen plaintext secure(CPA)and collusion resistant in the standard model.

关 键 词：Proxy re-encryption identity-based proxy re-encryption key-private collusion resistant 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]