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在基于身份的密钥提取过程中,使密钥生成器在私钥中嵌入随机数,从而使得密钥提取具有较好的灵活性,使得用户对一个身份可具备多个私钥,这无疑会增加密钥使用的安全性;基于这种新的密钥提取思路,给出一个基于身份的签名体制,新的密钥提取方式使得它具有更好的安全性和灵活性;新的基于身份的签名体制中具有最少对运算,因此,与类似的方案相比,其具备较好的计算效率;新签名体制的安全性依赖于k-合谋攻击问题(k-CAAP)的困难性,其在适应性选择消息和ID攻击下具备强不可伪造性,并且其安全性证明具有紧规约性.
In the process of identity-based key extraction, the key generator is allowed to embed a random number in the private key, so that the key extraction has better flexibility, so that the user can have multiple private keys for one identity, which undoubtedly Increase the security of using the key. Based on this new idea of key extraction, an identity-based signature system is given. The new key extraction method makes it have better security and flexibility. The new identity-based The signature system has the least pair of operations, so it has better computational efficiency than other similar schemes. The security of the new signature system depends on the difficulty of the k-collusion attack (k-CAAP) Sex-selective messages and ID attacks have strong unforgeability, and their security credentials have tight rules.