基于现有的(t,n)门限秘密共事方案,通过引入攻击结构的概念,提出了一种可以应用于访问结构上的动态先应式秘密共享方案,在更新子份额的同时可以改变秘密共享的访问结构.给出了子份额分发和子份额更新的详细步骤,并对方案的有效性进行了充分的证明.与现有方案的性能比较表明,该方案不仅计算量小,而且具有更大的应用灵活性.
Basing on the existing (t, n) secret sharing scheme, a dynamic proactive secret sharing scheme which can be applied to access structure is proposed by introducing the concept of adversary structure. The access structure can be changed when the shadows are renewed. The detailed process of the distribution and renewal of the shadows is given, and the validity of the scheme is proved perfectly. The comparisons with the existing schemes show that the proposed scheme is more flexible and its computational cost is less.