Definition
Visual cryptography or visual secret sharing represents a group of effective schemes for image and video hading and watermarking.
Visual cryptography (VC) or visual secret sharing (VSS) schemes [1] constitute probably the most cost-effective solution within a (k, n)-threshold framework. The VSS schemes use the frosted/transparent representation of the shares and the properties of the human visual system to force the recognition of a secret message from overlapping shares without additional computations or any knowledge of cryptographic keys [1–3].
As it is shown in Fig. 1, the conventional VSS schemes operate on a binary input. Following the encryption procedure in a (k, n)-threshold framework, the secret binary pixel is encrypted into n blocks of m 1 × m 2 binary pixels. The actual share blocks are randomly generated through the column permutation of the n × m 1 m 2 basis matrices. By repeating the process for all pixels of a K 1 × K 2secret (input) image, the VSS scheme...
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References
M. Naor and A. Shamir, “Visual Cryptography,” Lecture Notes in Computer Science, Vol. 950, 1994, pp. 1–12.
P.-A. Eisen and D.-R. Stinson, “Threshold Visual Cryptography Schemes with Specified Levels of Reconstructed Pixels,” Design, Codes and Cryptography, Vol. 25, No. 1, January 2002, pp. 15–61.
C.-N. Yang, “New Visual Secret Sharing Schemes Using Probabilistic Method,” Pattern Recognition Letters, Vol. 25, No. 4, March 2004, pp. 481–494.
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(2008). Visual Cryptography. In: Furht, B. (eds) Encyclopedia of Multimedia. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-78414-4_258
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