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

Ching-Nung YANG
Tse-Shih CHEN

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E89-A    No.2    pp.620-625
Publication Date: 2006/02/01
Online ISSN: 1745-1337
DOI: 10.1093/ietfec/e89-a.2.620
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Information Security
Keyword: 
visual secret sharing,  visual cryptography,  

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Summary: 
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.

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