A Study on Digital Image Steganography

Steganography is the art and science of invisible communication. The word steganography is derived from the Greek words "stegos" meaning "cover" and "grafia" meaning "writing" defining it as "covered writing". The existence of a message is secret. Steganography is usually implemented computationally, where cover Works such as text files, images, audio files, and video files are tweaked in such a way that a secret message can be embedded within them. In order to embed secret data into a cover message, the cover must contain a sufficient amount of redundant data or noise. This is because in the embedding process Steganography actually replaces this redundant data with the secret message. In image steganography the information is hidden exclusively in images. This paper intends to give an overview of image steganography.