Secure Optical Image Encryption and Data Hiding Technique in Compression Domain Using Dual Key-Based Bit Swapping

Abstract

Over the last twenty years or more, researchers have suggested a significant variety of optical information security systems that take advantage of the inherent benefits of optics to outperform existing digital security methods. Along with encryption, hiding secret data plays added advantages in various applications such as defense, biomedical diagnostics, and other security-related imaging applications. In this work, a new technique is proposed along with secret data hiding in the compressed bitstream. American Standard Code For Information Interchange (ASCII) representation is used directly to hide the secret text into the image using least significant bit (LSB) replacing technique. To evaluate the performance, various performance measures such as correlation coefficient (CC) of 0.99, peak signal to noise ratio (PSNR) of 28.53, mean square errors (MSE) of 0.0056, structural similarity index measure (SSIM) of 0.99, mean absolute errors (MAE) of 0.015, and root mean square error (RMSE) of 0.056 values are calculated. From the acquired result, it is quite obvious that this work delivers 0.2% high performance when compared to existing optical encryption methods.KeywordsOptical informationData hidingImage compressionLossless compressionASCIIBit swapping