一种新的前向安全可证实数字签名方案

基于前向安全数字签名和可证实数字签名的理论，一种前向安全可证实数字签名的新方案被提出，首次将数字签名的前向安全和可证实的功能结合在一起，并且证实过程应用零知识证明的思想．在因子分解、离散对数及二次剩余问题的困难假设下，系统是安全的．该方案的前向安全保证了即使当前时间段的签名密钥被泄漏，敌手也不能伪造以前的签名，在公钥固定不变的前提下，对密钥进行定期更新．并且由一个半可信任第3方——证实者——来验证签名，从而控制签名有效性的传播，并防止签名者对不利的签名拒绝验证的行为．

A New Forward-Secure and Confirmer Digital Signature Scheme

Based on the theory of forward secure digital signature scheme and confirmer signature scheme, a new forward secure and confirmer signature scheme is proposed It is the first time that forward secure and confirmer are combined in a digital signature scheme The idea of zero knowledge proof is used in the confirming process The scheme is proven to be secure under the assumption of the intractability of factoring and discrete logarithm and quadric remain problems Forward security of the scheme means that even if the secret key of current time period is compromised, some security remains: it is not possible to forge the signature relating to the past Secret key is evolved with different period time while the public key is fixed in the life time And the partially trusted player-conformer could verify the signature who can control the distribution of the verification of the signature and prevent the signer from denying the disadvantageous signature