Secured Communication of Text and Audio using Image Steganography

Data security has gained an utmost importance due to the unprecedented increase in the data generated over the internet, which is a basic necessity of any application in information technology. Steganography is a specialty of science to manage and conceal a piece of important information inside image, audio, video or text documents. Steganography is a method and study of composing a secret communication such that only the source and the targeted beneficiary will realize the concealed information. The data concealed or covered process starts with the steganography method by identifying a network canopy and redundant parts, i.e. only permitted persons would be able to change without affecting the quality of that medium. The encoding method generates a Stego medium by substituting these redundant bits with concealed message content. In the proposed work, an image is employed as the cover file and the data is kept secure with the assistance of the symmetric key, which the sender or source and the specified receiver or person must process. The proposed methodology has performed better with an improvement in PSNR and SNR values than the existing wavelet transform methodology as showed in experimental results. The proposed work is implemented using MATLAB.