A Study of Visual Cryptography Techniques for Secure Distribution of Images Over the Internet

With the rapid growth of Internet-based multimedia applications, secure image transmission has become a critical concern. Conventional cryptographic techniques rely on complex mathematical operations and key management mechanisms, which may not be suitable for lightweight or human-centric security systems. Visual Cryptography (VC) is a secret-sharing technique that allows images to be encrypted into multiple shares so that no single share reveals any information about the original image. Reconstruction is achieved by stacking the shares without requiring any computation. This paper presents a comprehensive study of visual cryptography techniques, including basic schemes, colour visual cryptography, security analysis, implementation challenges, and real-world case studies. The study highlights the effectiveness of VC in secure image distribution over the Internet and discusses its future research directions.