Towards accountable authority attribute-based encryption  

作　　者：王永涛 Chen Kefei Long Yu 

机构地区：[1]Department of Computer Science and Engineering,Shanghai Jiao Tong University [2]China Information Technology Security Evaluation Center [3]Shanghai Key Laboratory of Scalable Computing and System,Shanghai JiaoTong University

出　　处：《High Technology Letters》2013年第1期82-87,共6页高技术通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.60970111,60903189,60903020);the National High Technology Research and Development Programme of China(No.2009AA012418);the National Basic Research Program of China(No.2007CB311201);the Foundation of NLMC(No.9140C1103020803)

摘　　要：An accountable authority attribute-based encryption （A-ABE） scheme is presented in this paper. The notion of accountable authority identity-based encryption （A-IBE） was first introduced by Goyal at Crypto＇07. It is a novel approach to mitigate the （inherent） key escrow problem in identity-based cryptosystems. In this work, the concept of accountable authority to attribute-based encryption （ABE） setting is generalized for the first time, and then a construction is given. The scheme non-trivially integrates an A-IBE scheme proposed by Libert et al. with an ABE scheme. In our construction, a user will be identified by a pair （ id, o~）, where id denotes the user＇ s identity and ω denotes the set of attributes associated to the user. In addition, our construction is shown to be secure under some reasonable assumptions.An accountable authority attribute-based encryption(A-ABE)scheme is presented in this paper.The notion of accountable authority identity-based encryption(A-IBE)was first introduced by Goyal at Crypto'07.It is a novel approach to mitigate the(inherent)key escrow problem in identity-based cryptosystems.In this work,the concept of accountable authority to attribute-based encryption(ABE)setting is generalized for the first time,and then a construction is given.The scheme non-trivially integrates an A-IBE scheme proposed by Libert et al.with an ABE scheme.In our construction,a user will be identified by a pair(id,ω),where id denotes the user's identity andωdenotes the set of attributes associated to the user.In addition,our construction is shown to be secure under some reasonable assumptions.

关 键 词：CRYPTOGRAPHY attribute-based encryption accountable authority key escrow TRACEABILITY 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]