A Study on Digital Image Steganography and Watermarking

Steganography is the method of hiding the secret information in a medium (such as digital image, audio and video). Steganography comes from the Greek words “stegano” means covered and “graphy” means writing and thus means, covered writing. A medium that is used for hiding information is called a cover medium. After hiding secret information in a cover medium, a stego medium is obtained. The main purpose of steganography is to hide the information inside the cover medium so that it becomes impossible for intruder to detect the secret information present in the cover image.  This paper gives an overview of image steganography and watermarking that will allow transmitting the secret information without any changes on the internet. Watermarking technique provides us the copyright protection and image authentication.