可验证的多策略秘密共享方案

可验证多重秘密共享方案普遍不能区分共享群组密钥的安全等级，即分享群组密钥的门限值相等，为此，提出了一种可验证的多策略秘密共享方案. 在该方案中，密钥分发者能根据分发群组密钥的安全等级选择不同的门限值；在群组密钥分发和重构过程中，能实现参与者对密钥分发者和重构者对参与者的验证，及时检测和识别密钥分发者对参与者以及参与者对密钥重构者的欺骗，从而提高重构群组密钥的成功率；参与者的子密钥能重复使用，可减少密钥分发者的计算负担，提高方案的效率. 该方案具有较高的安全性和实用性.

A Verifiable Multi-Policy Secret Sharing Scheme

The secret sharing schemes are important techniques for key management. However, most verifiable multi secret sharing schemes can not distinguish the security classification because of having the common drawback of sharing secrets with the same value. A verifiable multi policy secret sharing scheme is proposed. The significant character of the proposed scheme is that each participant has to be kept only one master secret share, the share can be used to reconstruct different group secrets according to the number of threshold values. So it will reduce the calculated amount of the secret distributor. Moreover, the efficient solutions against multiform cheating are proposed, the scheme is therefore with highly security and practicality.