Chosen Ciphertext Secure Identity-Based Broadcast Encryption in the Standard Model  

作　　者：孙瑾 胡予濮 张乐友 

机构地区：[1]Key Laboratory of Computer Network and Information Security,Xidian University [2]Department of Application Mathematics,Xi'an University of Technology

出　　处：《Journal of Shanghai Jiaotong university(Science)》2011年第6期672-676,共5页上海交通大学学报（英文版）

基　　金：the National Natural Science Foundation of China (No.60970119);the National Basic Research Program (973) of China (No.2007CB311201)

摘　　要：To give concurrent consideration both the efficiency and the security(intensity of intractable problem) in the standard model,a chosen ciphertext secure identity-based broadcast encryption is proposed.Against the chosen ciphertext security model,by using identity(ID) sequence and adding additional information in ciphertext,the self-adaptive chosen identity security(the full security) and the chosen ciphertext security are gained simultaneously.The reduction of scheme's security is the decisional bilinear Diffie-Hellman(BDH) intractable assumption,and the proof of security shows that the proposed scheme is indistinguishable against adaptive chosen ciphertext attacks in the standard model under the decisional BDH intractable assumption.So the security level is improved,and it is suitable for higher security environment.To give concurrent consideration both the efficiency and the security （intensity of intractable problem） in the standard model, a chosen ciphertext secure identity-based broadcast encryption is proposed. Against the chosen ciphertext security model, by using identity （ID） sequence and adding additional information in cipher- text, the self-adaptive chosen identity security （the full security） and the chosen ciphertext security are gained simultaneously. The reduction of scheme＇s security is the decisional bilinear Diffie-Hellman （BDH） intractable assumption, and the proof of security shows that the proposed scheme is indistinguishable against adaptive chosen ciphertext attacks in the standard model under the decisional BDH intractable assumption. So the security level is improved, and it is suitable for higher security environment.

关 键 词：the standard model provably secure broadcast encryption the chosen ciphertext security the self-adaptive chosen identity security 

分 类 号：TN918.1[电子电信—通信与信息系统]