An Approach for Determining Optimal Contrast in Visual Cryptography Juhnke, Jakob Lefmann, Hanno Strehl, Volker Fortschritt-Berichte VDI 2013 info:eu-repo/semantics/report doc-type:report text http://purl.org/coar/resource_type/c_93fc https://ris.uni-paderborn.de/record/2917 Juhnke J, Lefmann H, Strehl V. <i>An Approach for Determining Optimal Contrast in Visual Cryptography</i>. Fortschritt-Berichte VDI; 2013. info:eu-repo/semantics/closedAccess