RS steganalysis on block based octal pair pixel value differencing method

The word Steganography refers to one of the challenging research area in secure and secret communication. Most of the steganography methods hide the secret data into the insignificant parts of the cover image. But in Pixel Value Differencing (PVD) Steganography methods, the secret data are embedded into the differences of adjacent pixels. This pair wise modification mechanism in cover image increases the histogram distortion. In order to reduce this histogram distortion and also to improve security, capacity and quality of steganography image a new Block Based Octal Pair Pixel Value Differencing Steganography Method (BOPVD) is proposed. The proposed BOPVD method mainly focuses on range tables and secondarily on pixel pair differences. Most of the existing PVD methods use the design of Wu and Tsai's range table. But the proposed method use new range table is much meaningful and also increases the security level in embedding and extracting of secret data. The proposed method uses 8-neighborhood pixels for embedding purposes. The cover image is split into 3×3 blocks. These blocks are randomly chosen for embedding so that it will increase the security and capacity of the proposed method when compared to other PVD methods. An experimental result of RS steganalysis reveals that the proposed method has resistances to steganalysis attacks and also better embedding efficiency with good visual image quality.