摘要
对组合公钥(CPK)体制标准进行了分析,认为在CPKv5.0中,实体组合私钥与密钥种子之间、私钥与私钥之间存在线性关系,且最大线性无关量不超过N1+N2,其中N1为标识矩阵的总量,N2为分割密钥序列的总量,实际的安全界限应是N1+N2,而不是N1×N2,因此CPKv5.0仍然不能抵抗共谋攻击,存在安全隐患。
This paper analyze the security of Combined Public Key(CPK) Cryptosystem and point out that in CPK v5.0 there exist linear relations between entity's Combined-key and generator keys of the system,the maximum nonlinear elements of Combined-keys are not large than N1+N2 and can't reach N1×N2,where N1 is the number of elements in Combining-matrix and N2 is the number of elements in Separating-key sequence.So the CPK system presented in v5.0 is still insecure against a key conspiracy attack.
出处
《计算机安全》
2012年第1期30-33,共4页
Network & Computer Security
关键词
标识
组合公钥
CPK
基于标识
公钥密码
identity
Combined Public Key
CPK
Identity-Based
Public Key Cryptograph
