Visual Cryptography Schemes with Dihedral Group Access Structure for Many Images

摘要

A new construction of visual cryptography scheme (VCS) with dihedral group access structure for two shares and many secret images is proposed. Let D_(2n) be a dihedral group of order 2_n, and let {Image(т) | т ∈ D_(2n) } be 2_n secret images corresponding to D_2n- In a VCS with dihedral group access structure, two shares (two transparencies) A and B are constructed so that for any element т of D_(2n), A and т(B) reconstruct the secret image Image(т). This new VCS is perfect and has contrast 1/(6_n~2).