Steganography in Black and White Picture Images

This paper proposes efficient method of embedding and extraction of data in Black and white pictures. The main focus of this method is on steganography in Black & white pictures. This method uses most of the flippable blocks without enforcing the odd-even features of non-uniform block. This improves the distortion in original image as blocks are remained unchanged and increases the capacity of hiding data. The length of the data is preceded to the data to be hidden to extract exact amount of data without the need of checking total picture. The number of bits required to identify the length of data is dependent on number of flippable blocks in picture. The embedded data is first encoded with the password for security purpose and then embedded which again reduces the number of bits required to represent data. The hidden data is extracted after decoding extracted bits from the stego-image with password without using original image accurately. Experiment shows the increased capacity of data embedding without causing noticeable artifacts.