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<p>In the literature a lot of studies were carried out on (2, <em>n</em>) visual cryptographic scheme (<em>VCS</em>) using either XOR or OR operation. A scheme on ideal contrast (2, <em>n</em>) <em>VCS</em> with reversing using combined OR and NOT operations was reported. In this paper, a construction on an ideal contrast (2, <em>n</em>) <em>VCS</em>using combined XOR and OR operations with less amount of transparencies than ideal contrast (2,<em>n</em>) <em>VCS</em> with reversing using OR and NOT operations is proposed. This paper also shows a construction of (2, <em>n</em>) <em>VCS</em> with pixel expansion one which perfectly reconstruct the white pixels and probabilistically reconstruct the black pixel using XOR operation.</p>
K. Praveen and Dr. M. Sethumadhavan, “Results on (2, n) Visual Cryptographic Scheme”, in Security in Computing and Communications: Second International Symposium, SSCC 2014, Delhi, India, September 24-27, 2014. Proceedings, J. Lloret Mauri, Thampi, S. M., Rawat, D. B., and Jin, D. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014, pp. 335–340.