Multipartite secret sharing schemes and applications

In the traditional secret sharing schemes, all participants areequal in terms of privileges but in specialsituations participants may not be equal. In this work we consider generalized access structures and linear secret sharing schemes for their realization.We studied hierarchical access structure to proposenew geometry based secret sharing scheme. Nested compartment access structure is considered where a hierarchicalis defined within compartment. Also a perfect ideal secret sharing scheme for nested compartment accesses structure is proposed. Proposed schemes are ideal and perfect.Hierarchical and nested compartmentimage secret sharing schemes is considered. In proposed schemes size of sharedimages is equal to secret image and PSNR in these schemes is infinite.