A methodology for data hiding using images

We present a method of embedding information within digital images, called spread spectrum image steganography (SSIS) along with its payload capacity. Steganography is the science of communicating in a hidden manner. SSIS conceals a message of substantial length within digital imagery while maintaining the original image size and dynamic range. The hidden message can be recovered using the appropriate keys without any knowledge of the original image. The capacity of the steganographic channel is described and the performance of the technique is illustrated. Applications for such a data hiding scheme include in-band captioning, hidden communication, image tamperproofing, authentication, invisible map overlays, embedded control, and revision tracking