一个新的门限证实数字签名方案

利用乘法秘密共享思想和RSA公钥密码算法提出了一个新的门限证实数字签名方案。新方案首次将门限数字签名和证实数字签名的功能结合起来,并且签名的证实和否认协议采用零知识证明的思想。新方案效率高,在二次剩余困难假设和RSA安全的条件下是安全的。新方案中由个参与者合作产生签名,由半可信任的第三方证实者完成签名的有效性验证,方案既能使签名方控制签名有效性的任意传播,又能防止签名方对不利签名的拒绝验证行为,有效保护验证者合法权益。新方案能应用于电子合同的公平签署。

A New Threshold and Confirmer Digital Signature Scheme

In this paper,a new threshold and confirmer signature scheme is proposed by using the idea of multiplica-tive secret sharing and famous public key cryptosystem RSA.It is the first time that threshold and confirmer are com-bined in a digital signature scheme.The idea of zero-knowledge proof also is used in the confirming and denying proto-col.The new scheme is secure under condition of intractability assumption of quadric remain and the security of RSA.In our scheme n signers generate a signature whose validity is verified by a semi-trusted third party,the confirmer who can control the diffusion of the validity of the signature and prevent the signer from denying the disadvantageous signa-ture to protect the benefit of verifier.The new scheme is efficient and can be applied to justice-subscribe of electronic contract.