Visual cryptography via halftoning

Gonzalo R. Arce; Zhi Zhou; Giovanni Di Crescenzo

doi:10.1117/12.532655

18 December 2003 Visual cryptography via halftoning

Gonzalo R. Arce, Zhi Zhou, Giovanni Di Crescenzo

Proceedings Volume 5293, Color Imaging IX: Processing, Hardcopy, and Applications; (2003) https://doi.org/10.1117/12.532655
Event: Electronic Imaging 2004, 2004, San Jose, California, United States

Abstract

Visual cryptography encodes a secret binary image SI into n shares of random binary patterns. The secret image can be visually decoded by superimposing a qualified subset of shares, but no secret information can be obtained from the superposition of a forbidden subset. Such a scheme is mathematically secure, however, the binary patterns of the n shares have no visual meaning, raising the suspicion of data encryption. In order to achieve a higher level of security, halftone visual cryptography was proposed to encode a secret binary image into n halftone shares (images) carrying significant visual information. The method is further extended in this paper. Based on blue-noise dithering principles, a global optimization method is proposed to improve the overall visual quality of all n halftone shares. Thus, the adversaries are less likely to suspect the presence of hidden cryptographic information.

Citation Download Citation

Gonzalo R. Arce, Zhi Zhou, and Giovanni Di Crescenzo "Visual cryptography via halftoning", Proc. SPIE 5293, Color Imaging IX: Processing, Hardcopy, and Applications, (18 December 2003); https://doi.org/10.1117/12.532655

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