Secure Image Steganography Using Tri - Way Pixel - Value Differencing on Two Cover Images

摘要

In tri - way pixel - value differencing (TPVD) steganography approach, three different directional edges of the cover image are considered to create a stego image. TPVD gives more hiding capacity as compared to original pixel value differencing (PVD) method referring to only one direction. Encryption with steganography gives more secrecy protection to the system. In this paper, a more secure image steganographic technique is proposed, which includes encryption of image before embedding it in, two cover images using TPVD. Experimental results demonstrate that use of two cover images provide high embedding capacity. The peak signal to noise ratio (PSNR), mean square error (MSE) and hiding capacity are evaluated as performance parameter and found to have reasonable values as compared to previous related work. Encryption before embedding protects the information from unauthorized access. The embedded confidential information can be retrieved from the stego images successfully without assistance of original images.