A Survey on Image Steganography Techniques

Steganography refers to the exchange of hidden data. It deals with the study of invisible communication between the sender and the receiver. In today's modern world transferring secured data over a network is the main concern, hence for secured communication steganography is used. The data that is to be sent is concealed behind a text, image, or an audio file. The attacker or the eavesdropper, who observes the object with embedded data, will not notice it and thus would not try to decrypt the hidden data. Steganography is useful in many areas like efficient confidential communication, protection from data modification, and media database systems. It preserves the confidentiality of the information, which ensures that during communication there will be no alteration in the content of the information. Steganography can be classified into image steganography, audio/video steganography, or text steganography. This paper gives an overview of image steganography and its various techniques to hide the data behind the image. The techniques are discussed and analysed based on their ability to hide the information securely.