New Size-Reduced Visual Secret Sharing Schemes with Half Reduction of Shadow Size

Authors:
Ching-Nung Yang;Tse-Shih Chen
Affiliations:
The authors are with the Department of Computer Science and Information Engineering, National Dong Hwa University, Hualien, 974, Taiwan. E-mail: cnyang@mail.ndhu.edu.tw;The authors are with the Department of Computer Science and Information Engineering, National Dong Hwa University, Hualien, 974, Taiwan. E-mail: cnyang@mail.ndhu.edu.tw
Venue:
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Year:
2006

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Abstract

The Visual Secret Sharing (VSS) scheme proposed by Naor and Shamir is a perfectly secure scheme to share a secret image. By using m sub pixels to represent one pixel, we encrypt the secret image into several noise-like shadow images. The value of m is known as the pixel expansion. More pixel expansion increases the shadow size and makes VSS schemes impractical for real application. In this paper, we propose new size-reduced VSS schemes and dramatically decrease the pixel expansion by a half.