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- Title
Visual cryptograms of random grids via linear algebra.
- Authors
Shen, Gang; Liu, Feng; Fu, Zhengxin; Yu, Bin
- Abstract
Two visual models of image secret sharing have been studied: visual cryptography schemes (VCS), introduced by Naor and Shamir, and visual cryptograms of random grids (VCRG), introduced by Kafri and Keren. VCRG has gained much attention in academia than before to avoid the pixel expansion of VCS. Although there is a strict relation between VCRG and VCS, VCRG can still be improved to achieve a better result. In this paper, based on new insight into linear algebraic technique to construct VCS, where we are able to construct VCS by solving a linear system of more equations at a time, we put forward a new construction of VCRG for general access structures. The effectiveness and advantage of the proposed construction are formally analyzed and experimentally demonstrated. With theoretical and practical interests, our construction exposes new possibilities to the researches of visual models of image secret sharing.
- Subjects
IMAGE analysis; VISUAL cryptography; LINEAR algebra; CRYPTOGRAMS; CRYPTOGRAPHY research
- Publication
Multimedia Tools & Applications, 2018, Vol 77, Issue 10, p12871
- ISSN
1380-7501
- Publication type
Article
- DOI
10.1007/s11042-017-4921-5