Towards Shift Tolerant Visual Secret Sharing Schemes without Pixel Expansion
1 Department of Computer Science & Information Engineering, National Chi Nan University, 54561 Nantou, Taiwan
2 School of Computer Science and Engineering, The University of Aizu, 965-8580 Fukushima, Japan
a Corresponding author: firstname.lastname@example.org
Naor and Shamir proposed the visual cryptography in 1995, they encrypted secret image into two meaningless random images, called shares, and it can be decrypted by human vision without any calculations. However, there would be problems in alignment when these two shares are staked by hand in practical. Therefore, this paper presents the fault-tolerant schemes of stacking two shares which are acquired from secret image encryption without pixel expansion. The main idea of these schemes is combining several pixels to be a unit, then encrypting every unit into a specific combination of pixels. It makes visual secret sharing scheme more practical.
© The Authors, published by EDP Sciences, 2016
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