A Certificateless Threshold Public Key Encryption Scheme  

作　　者：ZOU Xiubin ZOU Ran 

机构地区：[1]School of Computer Science and Technology,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China [2]College of Computer and Mathematics,Jianghan University,Wuhan 430056,Hubei,China [3]Ira A.Fulton Schools of Engineering,Arizona State University,Arizona 85287-9309,USA

出　　处：《Wuhan University Journal of Natural Sciences》2012年第3期223-228,共6页武汉大学学报（自然科学英文版）

基　　金：Supported by the National Natural Science Foundation of China(60903175,60703048);the Natural Science Foundation of Hubei Province (2009CBD307,2008CDB352)

摘　　要：The decryption participant＇s private key share for decryption is delegated by key generation center in the threshold IBE scheme.However,a key generation center which is absolutely trustworthy does not exist.So the author presents a certificateless threshold public key encryption scheme.Collaborating with an administrator,the decryption participant generates his whole private key share for decryption in the scheme.The administrator does not know the decryption participant＇s private key share for decryption.Making use of q-SDH assumption,the author constructs a certificateless threshold public key encryption scheme.The security of the scheme is eventually reduced to the solving of Decisional Bilinear Diffie-Hellman problem.Moreover,the scheme is secure under the chosen ciphertext attack in the standard model.The decryption participant＇s private key share for decryption is delegated by key generation center in the threshold IBE scheme.However,a key generation center which is absolutely trustworthy does not exist.So the author presents a certificateless threshold public key encryption scheme.Collaborating with an administrator,the decryption participant generates his whole private key share for decryption in the scheme.The administrator does not know the decryption participant＇s private key share for decryption.Making use of q-SDH assumption,the author constructs a certificateless threshold public key encryption scheme.The security of the scheme is eventually reduced to the solving of Decisional Bilinear Diffie-Hellman problem.Moreover,the scheme is secure under the chosen ciphertext attack in the standard model.

关 键 词：certificateless public key cryptosystem identity-based encryption threshold public key encryption decisional bilinear Diffie-Hellman assumption bilinear pairings 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]