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Unforgeability of an improved certificateless signature scheme in the standard model

机译:标准模型中改进的无证书签名方案的不可伪造性

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Certificateless signature is an interesting cryptographic primitive which does not suffer from the inherent key escrow problem of identity-based cryptography and the costly certificate management problem of traditional public key cryptography. Since security proofs in the random oracle model can only be viewed as heuristic arguments and cannot ensure the security in the real implementation, certificateless signature schemes with security proofs in the standard model (i.e. without random oracles) is more desirable. Some attempts have been devoted to propose certificateless signature schemes in the standard model, whereas all of these schemes are later shown to be either insecure or flawed in the security proofs. Recently, a new certificateless signature scheme in the standard model has been proposed. However, in this study the authors show that this scheme cannot resist the key replacement attack, and hence it is not existentially unforgeable.
机译:无证书签名是一种有趣的密码原语,它不受基于身份的密码的固有密钥托管问题和传统公钥密码的昂贵的证书管理问题的困扰。由于随机oracle模型中的安全性证明只能被视为启发式参数,不能在实际实现中确保安全性,因此更需要在标准模型中具有安全性证明的无证书签名方案(即无随机oracles)。已经进行了一些尝试以在标准模型中提出无证书签名方案,而所有这些方案后来都被证明在安全性证明中不安全或有缺陷。最近,在标准模型中提出了一种新的无证书签名方案。但是,在这项研究中,作者表明该方案无法抵抗密钥替换攻击,因此它并不是存在不可伪造的。

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