Visual Cryptography Schemes with Perfect Reconstruction of Black Pixels

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Provided by: ISR JOURNALS
Topic: Security
Format: PDF
Conventional Visual Cryptography (VC) suffers from a pixel-expansion problem, or an uncontrollable display quality problem for recovered images, and lacks a general approach to construct Visual Secret Sharing schemes (VSSs) for General Access Structures (GASs). The authors propose here in a general and systematic approach to address these issues without sophisticated codebook design. The approach can be used for binary secret images in non-computer-aided decryption environments. To avoid pixel expansion, they design a set of column vectors to encrypt secret pixels rather than use the conventional VC-based approach.
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