一种可验证的动态秘密分享方案

A Verifiable Dynamic Secret Sharing Scheme

针对已有的秘密分享方案都要求安全传输信道这一问题,对门限秘密分享方案的安全性进行了研究。在Shamir门限方案的基础上,结合大素数阶有限域上离散对数难解问题、单向hash函数和公钥密码体制,提出了一种可验证的动态秘密分享方案。该方案不需要安全传输信道,能有效检测内、外部欺诈者,具有子密可复用、公开的信息量少等特点,效率高且实用。

Secret transmission channels are needed in the existed secret sharing schemes.Aiming at this problem,the security of threshold secret sharing schemes is researched.A verifiable dynamic secret sharing scheme based on Shamir's threshold scheme ,which is integrated with the computational difficulty of discrete logarithms over finite field of large prime order and one-way hash functions and public cryptosystems ,is proposed in this paper.The scheme has strong power to identify inner and outer cheaters.In this scheme ,the secret transmission channel is not necessary,the shadows can be reused,and only a few parameters should be public.The scheme is efficient and practical.