2D Barcodes for visual cryptography

Threshold visual secret sharing by random grids with improved contrast

(2013) Teng Guo et al.   JOURNAL OF SYSTEMS AND SOFTWARE

Comment on “Cheating Prevention in Visual Cryptography”

(2012) Yu-Chi Chen et al.   IEEE TRANSACTIONS ON IMAGE PROCESSING

A new authentication based cheating prevention scheme in Naor–Shamir’s visual cryptography

(2012) Yu-Chi Chen et al.   JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION

Cheating immune visual cryptography scheme

(2011) F. Liu et al.   IET Information Security

Insight into collusion attacks in random-grid-based visual secret sharing

(2011) Yao-Sheng Lee et al.   SIGNAL PROCESSING

Some Extensions on Threshold Visual Cryptography Schemes

(2009) F. Liu et al.   COMPUTER JOURNAL

Colour visual cryptography schemes

(2008) F. Liu et al.   IET Information Security