Enhanced Security for Military Grid Reference System Using Visual Cryptography
Sandhya Anne Thomas, Saylee Gharge · 2018
Security is one of the greatest challenge with increased and developed technology. Visual Cryptography is an answer to information security which provides absolute security with less complication and requirements. Encoding is done using Visual cryptography(VC) approach and decoding by the authorized person doesn't need strong knowledge of the subject. VC works on binary images only which is a drawback of this approach, to overcome this problem Halftone Visual Cryptography(HVC) is taken. Enhanced HVC(EHVC) increases the security by using meaningful shares. In this paper two simple and strong halftone techniques namely Error Diffusion and Direct binary search(DBS) is implemented, compared, and modified for better visual decoded/recovered output. This technique is applied for Military Grid Reference System. Comparisons have been made visually and using parameters like Peak Signal to Noise Ratio (PSNR), Correlation, Universal Quality Index(UQI) and Structural Similarity(SSIM).