A novel image steganographic approach by Pixel Position Modulus Method (PPMM)

In this highly digitalized world, maintaining the security of confidential data poses to be a serious challenge. One of the security policies, that can be implemented here is encrypting the data before sending it through any communicational channel. This may attract the attention of several hackers since it is portrayed as encrypted. In this context, we have steganography as an emerging area, which hides the presence of private data within any universal transmission media so as to achieve secret communication. In this paper, we propose a new approach of encryption and insertion, which promotes an enhanced security to the confidential image. Here, 2D Discrete Haar Wavelet Transform has been applied to the cover image to compute its coefficient matrices. A scrambled form of the secret image is obtained by applying a transformation over it. To provide an imperceptible vision of the stego-image during communication via a public media, a new steganographic method known as PPMM is incorporated for secret data hiding in the wavelet coefficients. The results obtained after incorporating the algorithm shows that the same has a high imperceptibility for human vision and is thus very adept. The embedding capacity of the newly proposed technique is very high as well.