JPEG Anti-Forensics with Undetectability and Image Quality

Abstract:- Anti-forensic methods are actions whose goal is to prevent proper forensic investigation process. In the field of anti-forensics, a set of techniques are designed to fool current forensic methodologies. An image’s JPEG compression history is used to provide evidence of image manipulation, it provides information about the camera used to generate the particular image and identify forged regions within an image. When an image is JPEG compressed it would affect the visual quality of the image and forensic detectors are able to identify the traces of the image that it should be JPEG compressed or not. This paper focuses an anti-forensic method which aims at removing from an image the footprints left by JPEG compression in both spatial domain and DCT domain. It can defeat the existing forensic detectors which aim to identify the traces of JPEG compression history. It provides a better tradeoff between the forensic undetectability and the visual image quality. Keywords-Anti-Forensics,JPEG compression, image manipulation, DCT 1