Improved Stegosystem Using DFT with Combined Error Correction and Spread Spectrum

Steganography deals with hiding of messages such that potential monitors do not even know that a message is being sent. All files sent through Internet may be affected, either by compression due to the compression nodes or by transmission errors during the transmission or by noise. The proposed system provides certain level of immunity against moderate compression ratios and operates successfully under relatively high noise levels. The benefits of spread spectrum technique together with the advantage of error-correction coding are combined with DFT in order to increase the robustness of the system. Although, the robustness of our system is increased, the capacity of the stego-image is affected. The performance measure used for the perceptibility of the hidden message is based on peak SNR for the stego-image.