可验证的动态多秘密共享

提出了一种新的可验证的动态门限多秘密共享方案。该方案的安全性基于Shamir的秘密共享体制和椭圆曲线加密算法的安全性以及椭圆曲线离散对数问题的求解困难性。共享秘密可以周期性的改变,秘密分发者周期性的改变公告栏上的信息以增强系统的健壮性。对于不同的共享秘密,秘密分发者可以动态调整该秘密的门限值。此外,方案能有效检测和识别参与者的欺骗行为,参与者也可以验证其接受到的信息,且无需改变私有信息在任何时候都可以重构秘密。由于公告栏上的信息是定期更新的,所以不会影响新秘密的共享。

Verifiable Dynamic Multi-secret Sharing Scheme

The paper proposes a new verifiable multi-secret sharing scheme of dynamic threshold. The security of the proposed scheme is based on Shamir＇ s secret sharing scheme and the ECIES cryptosystem, and the difficulty in solving the elliptic curve discrete logarithm. In the scheme, the secret will change periodically and the dealer will periodically publish some of the information to increase the robustness of system. The dealer could adjust the threshold value de- pending on the secure level of different secret. In addition, the efficient solutions against multiform cheating of any participant are proposed, and the participants can verify the information which they have received. Each participant uses his own private secret during different time periods to reconstruct the corresponding shared secrets without revealing their own private information. Public information is renewed periodically in the scheme, which will not influence new secret sharing.