Yet another multiple-image encryption by rotating random grids

Authors:
Tzung-Her Chen;Kai-Hsiang Tsao;Yao-Sheng Lee
Affiliations:
Department of Computer Science and Information Engineering, National Chiayi University, Chiayi City 60004, Taiwan, ROC;Department of Computer Science and Information Engineering, National Chiayi University, Chiayi City 60004, Taiwan, ROC;Department of Computer Science and Information Engineering, National Chiayi University, Chiayi City 60004, Taiwan, ROC
Venue:
Signal Processing
Year:
2012

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Abstract

A visual secret sharing (VSS) technique constructed by random grids (RG) aims at encrypting a secret image into several shared ones and, later, reconstructing the secret by stacking the shared images to be recognized by the human visual system. The main advantages of VSS by adopting random grids, not Visual Cryptography (VC), include no pixel expansion, or cost of sophisticated codebook design. The authors of this paper present a new RG-based VSS scheme, which encrypts up to four secret images into two random grids without any pixel expansion and, later, decrypts one secret image by directly stacking two random grids and the other three in an additional way of rotating one RG at 90, 180, or 270 degrees, respectively. The proposed scheme not only raises the capacity of secret communication but also avoids the pixel expansion problem so that the overhead of storage and communication can be significantly reduced.