Chosen Ciphertext Secure Fuzzy Identity Based Encryption without ROM  

作　　者：方黎明 王建东 任勇军 夏金月 卞仕柱 

机构地区：[1]College of Information Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016 China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2008年第6期646-650,共5页上海交通大学学报（英文版）

基　　金：the National High Technology Research and Development Program (863) of China(No. 2006AA12A106)

摘　　要：Two new constructions of chosen-ciphertext secure fuzzy identity-based encryption （fuzzy-IBE） schemes without random oracle are proposed. The first scheme combines the modification of chosen-plaintext secure Sahai and Waters＇ ＂large universe＂ construction and authenticated symmetric encryption, and uses con- sistency checking to handle with ill-formed ciphertexts to achieve chosen-ciphertext security in the selective ID model. The second scheme improves the efficiency of first scheme by eliminating consistency checking. This improved scheme is more efficient than existing chosen-ciphertext secure fuzzy-IBE scheme in the standard model.Two new constructions of chosen-ciphertext secure fuzzy identity-based encryption(fuzzy-IBE) schemes without random oracle are proposed.The first scheme combines the modification of chosen-plaintext secure Sahai and Waters'"large universe"construction and authenticated symmetric encryption, and uses consistency checking to handle with ill-formed ciphertexts to achieve chosen-ciphertext security in the selective ID model.The second scheme improves the effciency of first scheme by eliminating consistency checking.This improved scheme is more effcient than existing chosen-ciphertext secure fuzzy-IBE scheme in the standard model.

关 键 词：fuzzy identity based encryption （fuzzy-IBE） chosen-ciphertext security standard model 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]