Realization of Ideal Multipartite Access Structure Based on Threshold Scheme

This paper introduces the concept of multipartite access structure.In this structure,the set of participants is partitioned into w subsets and all participants in the same subset play an equivalent role.The(t,n)-threshold scheme is a mechanism that allows a set of n participants to share a secret such that only subsets of t or more participants can recover it.This paper presents ideal secret sharing schemes that can realize multipartite access structures by using threshold scheme repeatedly and proves that multipartite access structures are ideal access structures.