A novel image steganographic methodology by Power Modulus Scrambling (PMS) with logistic mapping

Globally acknowledged medium, like internet, does not guarantee full security to the secrecy of confidential data. Cryptography, a practice to secure secret data using encryption techniques, provides protection, only to a certain extent, due to its clearly visible low perceptual transparency. To recast this glitch, steganography comes into action. In this paper, we have proposed a significantly novel steganographic approach, which sustains secured transmission. To begin with, the host or cover image is scuffled into a chaotic form, thereby encrypting itself. Embedding of the secret data into this scrambled image is accomplished in the next lap followed by reapplication of our proposed scuffling algorithm, thus obtaining the stego-image. No perceptible degradation in the quality of the image is detected. In the extraction phase, descrambling of the stego-image is carried out by the reverse algorithm and the secret image is extracted using the same method as that of embedding. The above proposed system has a huge embedding capacity.