On a Visual Secret Sharing Scheme with High Quality Decryption

With the growing usage of visual media in practically all areas of applications including e-commerce/mcommerce, security has become one of the major concerns while sending secret information. Visual secret sharing scheme (VSSS) enables in encrypting a secret into meaningless share images so that the information can be revealed by human visual system (HVS) without using any device or complex mechanism. Most of the existing visual secret sharing schemes involve pixel expansion that increases the memory requirement and communication time. A novel approach of visual encryption has been recently introduced in [3] that does not require pixel expansion. However, we observed that the technique suffers from the problem of low contrast after decryption which makes it difficult for the HVS to decipher. In the present paper, we propose a VSSS that produces high contrast images after decryption making it easier for the HVS to reveal the information. It is worthwhile to mention here that we are able to minimize the communication time and memory requirement while producing better quality decryption for HVS.