A bit-level visual secret sharing scheme for multi-secret images using rotation and reversion operatations

Abstract

In 1995, Naor and Shamir proposed a visual secret sharing scheme to share a secret image with several participants. In this chapter, we extend the concept of visual secret sharing to gray-scale image visual secret sharing. This chapter applies the rotation and reversion operations to increase the security of the secret images and the utilization of the shared shadows. The experimental results show that the scheme can completely reconstruct the original gray-scale image, and the shadows can be used to hide more secret images. In addition, the proposed scheme can be extended to the application that some specific participants are only allowed to restore a certain amount of secret information. © Springer-Verlag Berlin Heidelberg 2007.