Abstract: Steganography is the art and science of writing hidden messages in such a way that no one apart from sender and intended recipient even realizes that the communication is going on in the first place. It can also be used to authenticate the images. Steganography techniques are categorised into spatial domain and frequency domain techniques. For hiding secret information in images, there exists variety of techniques like LSB, PVD, HoEMD. This paper presents a modulus and cryptography based technique to authenticate the images and can be used to prevent image forgery. The analysis on all the previously implemented techniques and proposed method is done and it has been proved that proposed method has a better PSNR value, hence leading to better image quality.

Keywords: Steganography, spatial, encryption, frequency, DES