Image Steganography Based on Discrete Wavelet Transform and Chaotic Map

'Steganography is the science of hiding information in the cover media', a force in the context of information security. In this work, a gray image was hidden into another gray scale image using an algorithm was proposed. Firstly, the secret image was encrypted using 'logistic chaotic map' to achieve 'high security'. Then the encrypted secret image embedded into the HH sub band of the wavelet transformed cover image. Favorable results obtained using peak signal to noise ratio (PSNR) and correlation criteria. The implementation of our proposed method done using MATLAB version 2010a.