International Journal of Computer Science and Mobile Computing (IJCSMC)
Steganography can be defined as the process of hiding information by embedding messages within other; Information can be in the form of text, audio and video. Pixel Value Differencing (PVD) is a steganography method which embeds secret data in images based on spatial information. And to improve the capacity of hiding data is increased by using tripixel difference value method. In which data is hidden in 2x2 square block. Here, proposed paper improves the security of existing TPVD method by making certain modification to make it to more robust to histogram quantization.