A New Probabilistic Visual Secret Sharing Scheme for Color Images

In 2007, Wang et al. proposed two visual secret sharing (VSS) schemes based on Boolean operations. The first one is a probabilistic (2, n) secret sharing scheme called (2, n) ProbVSS scheme for binary images. The other is a deterministic (n, n) secret sharing scheme for grayscale images. Although Wang et al.psilas two schemes solve the problems of computational complexity and pixel expansion at the same time; they cannot be applied to color images. To expand core concept of Wang et al.psilas (2, n) ProbVSS scheme to color images, in this paper, we combine Shamirpsilas scheme and Chang and Wupsilas gradual search algorithm for a single bitmap BTC (GSBTC) to design a new (2, n) ProbVSS scheme for color images. Experimental results confirm that our proposed scheme not only generates reconstructed color images with high quality, reduces successfully shadow size but also gives random-like grayscale images as shadows for color images.