A NOVEL DIGITAL IMAGE STEGANOGRAPHY USING DISCRETE WAVELET TRANSFORM.

Abstract

Steganography is the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message, This can be achieve by concealing the existence of information within seemingly harmless carriers or cover, the text, image, video, audio, etc can be used as a carrier to embed the information. In this paper, we propose a modified secure and high capacity based Steganography scheme of hiding a large-size secret image into a small-size cover image. Arnold transformation is performed to scrambles the secret image. Discrete Wavelet Transform (DWT) is performed in both images and followed by Alpha blending operation. Then the Inverse Discrete Wavelet Transformation (IDWT) is applied to get the stego image. We have investigated the performance of our scheme by comparing various qualities of the stego image and cover image, the modified Steganography is highly secure with certain strength in addition to good perceptual invisibility.