Abstract: Digital images are present everywhere on magazine covers, in newspapers, in courtrooms as evidence and all over the Internet signifying one of the major ways for communication nowadays. The trustworthiness of digital images has been questioned, because of the ease with which these images can be manipulated in both its origin & content as a result of tremendous growth of digital image manipulation tools. Digital image forensics is the latest research field which intends to authorize the genuineness of images. This survey attempts to provide an overview of various digital image forgeries and the state of art passive methods to authenticate digital images.
Keywords: Digital image forensics, Image authentication, Image forgery, Image tampering, Passive methods.