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 au...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.展开更多
为简化传统公钥密码系统中的证书管理过程,消除基于身份公钥密码系统中的密钥托管隐患,提出一种新的无证书盲签名方案,在随机预言模型中对适应性选择消息及身份攻击是存在性不可伪造的,且方案安全性可以归约为离散对数问题的难解性。分...为简化传统公钥密码系统中的证书管理过程,消除基于身份公钥密码系统中的密钥托管隐患,提出一种新的无证书盲签名方案,在随机预言模型中对适应性选择消息及身份攻击是存在性不可伪造的,且方案安全性可以归约为离散对数问题的难解性。分析结果表明,与现有签名算法与验证算法相比,该方案由于没有使用耗时较多的双线性对运算和Map To Point散列函数运算,在计算性能上具有明显优势。展开更多
基金Supported by the National Natural Science Foundation of China(60903175,60703048)the Natural Science Foundation of Hubei Province (2009CBD307,2008CDB352)
文摘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.
文摘为简化传统公钥密码系统中的证书管理过程,消除基于身份公钥密码系统中的密钥托管隐患,提出一种新的无证书盲签名方案,在随机预言模型中对适应性选择消息及身份攻击是存在性不可伪造的,且方案安全性可以归约为离散对数问题的难解性。分析结果表明,与现有签名算法与验证算法相比,该方案由于没有使用耗时较多的双线性对运算和Map To Point散列函数运算,在计算性能上具有明显优势。
