Dynamic Proactive Secret Sharing Scheme Based on Access Structure

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.