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Proceedings Article | 18 December 2003 Paper

Visual cryptography via halftoning

Gonzalo Arce, Zhi Zhou, Giovanni Di Crescenzo

Proceedings Volume 5293, (2003) https://doi.org/10.1117/12.532655

KEYWORDS: Halftones, Visualization, Virtual colonoscopy, Binary data, Matrices, Cryptography, Information visualization, Information security, Image quality, Computer programming

Read 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.

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