Two-in-One Image Secret Sharing Scheme Based on Boolean Operations

Two-in-one image secret sharing (TiOISS) scheme shares a secret image into n multiple shadows. In the revealing process, stacking any k (k <= n) shadows can decode a vague secret image in the first stage. It also can reveal the original secret image by computation in the second stage. Many TiOISS schemes have proposed based on visual cryptography scheme (VCS) and polynomial-based image secret sharing (PISS). Since PISS reveals the secret image by Lagrange's interpolation, it needs complicated computation. In this paper, we combine perfect black VCS with image secret sharing based on Boolean operations, and propose a new TiOISS scheme. Compared with existing TiOISS schemes, our scheme only needs few XOR operations to reveal the secret image in the second-stage reconstruction phase.