Chinese Journal of Computers   Full Text
Title	A New Visual Hiding Scheme Using One Secret Image
Authors	LIU Duo1),2) DAI Yi-Qi2)
Address	1)(School of Software Engineering, Beijing Jiaotong University, Beijing 100044) 2)(Department of Computer Science and Technology, Tsinghua University, Beijing 100084)
Year	2009
Issue	No.11(2247—2251)
Abstract &   Background	Abstract For presenting a new technique of digital watermarking, a new scheme on hiding a secret image into single shadow image is proposed. Differ from any existed methods of visual hiding schemes using one secret image, the new scheme based on the rotation of the shadow image. In the new scheme, the single shadow image acted both encoder and decoder function. Therefore the secret image can be recovered by stacking the shadow image and the shadow image after rotated 90 degree anticlockwise. The new method has the property of anti-compression, anti-distortion and anti-shrink. Furthermore, the new scheme can use the shadow image sufficiently. Keywords information security; information hiding; visual hiding; digital watermarking Background Visual cryptography, which is invented by Naor & Shamir in 1994, is a method for securely encrypting messages in such a way that the recipient won’t need a computer to decrypt them. The underlying cipher is essentially the one time pad; so the system is unbreakable in the information theoretical sense. Since then, many extensions and improvements of visual cryptography were proposed. However these schemes need to stack at least two secret shares to recover the secret image. In the case that one share is deformed or is not be true to the original, the secret image is hard to recover. To overcome this disadvantage, some visual hiding schemes using one secret image were proposed. This paper presents a new scheme on hiding a secret image into single shadow image. It can also be used as a technique of digital watermarking. Differ from any existed methods of visual hiding schemes using one secret image, the new scheme based on the rotation of the shadow image. In the new scheme, the single shadow image acted both encoder and decoder function. Therefore the secret image can be recovered by stacking the shadow image and the shadow image after rotated 90 degree anticlockwise. The new method has the property of anti-compression, anti- distortion and anti-shrink. Furthermore, the new scheme can use the shadow image sufficiently. This work was supported by the National Natural Science Foundation of China (grant No.60673065)