Liu, Feng; Guo, Teng; Jiao, Jian; Wang, Wen - In: International Journal of Digital Crime and Forensics (IJDCF) 9 (2017) 2, pp. 38-44
In this paper, we first follow Ateniese et al.'s work that provides upper bounds of the pixel expansion of visual cryptography schemes(VCSs) for more kinds of graph access structures, in which we require that a subset of parties can determine the secret if they contain an edge of the graph G....