Steganography: Dct Coefficient Replacement Method andCompare With Jsteg Algorithm

Abstract

Steganography is a method for hiding secret data in another media which is called cover. The selection of cover and techniques for hiding data is for caching less attention and visual distortion. The outlet of steganography system is called Steganograme which has the similar characteristics to the cover, and also it contains our hidden information. Steganography is not a new subject which is considered nowadays, its history can be traced in 440 BC. In the first usage of this knowledge the secret messages were written on the shaved head of Greek soldiers, when their hair grew up, the messages were concealed from the others. By development of digital communication and multimedia technology, steganography is being entered to a new season. These days images, audio and video files can be used as a cover media. In this paper, a digital image is used for this reason. By changing the way of data embedding in JSteg algorithm a new method can be achieved, which has higher signal to noise ratio and also its coefficient histogram is more similar to the cover image histogram. Most of the steganography techniques; which hide the data