Images play an important role in forensics laboratory. Due to easy availability of image editing and processing tools it is simple to manipulate and modify digital images without leaving any obvious traces of tampering. For digital image used as evidence, image authentication is necessary. In this paper, first, different image tampering techniques are discussed. Retouched image forgery technique is discussed. Steganography is discussed and its difference with image tampering. A method for Steganalysis is discussed. Finally conclusion and future work is discussed.

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