A Review on Image Steganography

Steganography is a form of information hiding. Today there is a very large demand of applications which require data to be transmitted in a safe and secure manner. Steganography is one of the methods used for the hidden exchange of information and it can be defined as the study of invisible communication that does not attract attention from eavesdroppers and attackers. The main requirements of any steganography system are undetectability, robustness and capacity to hide data. This paper includes the important steganography methods and the main focus is on the review of steganography in digital images. Terms used in the paper are M message, C cover image, Z stego image, Em embedded message, Ex extracted message.