A VISUAL CRYPTOGRAPHY WATERMARKING SYSTEM FOR DETECTING AND IDENTIFYING TAMPERED IMAGES

A VISUAL CRYPTOGRAPHY WATERMARKING SYSTEM FOR DETECTING AND IDENTIFYING TAMPERED IMAGES

K.GAYATHRI NAGA BHANU , N.HARINI, G.DINEETH UDBHAV , MR.V.PRASANNANJANEYA REDDY

ECE

INSTITUTE OF AERONAUTICAL ENGINEERING HYDERABAD

Abstract: In the current digital era, protecting the legitimation and integrity of the image is of the main problems due to the wide access of image editing tools for forgeries. This report presents a watermarking approach based on visual cryptography for the detection and localization of image forgery. The suggestion deals with putting a watermark on the host image by visual cryptography. This was the division of the image into several parts. However, only when all these shares are placed on top of each other at the correct position the watermark is visible. As a result, the watermark is hidden, the secrecy is preserved, and the security of the watermark improves. With the use of cryptographic shares within the watermark, the technique enables detection and restitution of a point of the image that the tamper has altered. Visual cryptography is used to ensure that the watermark is invisible and, it is a security artwork that protects the watermark against unauthorized extraction. The data along with the experimental results are conveyed demonstrating that the method withstands regular image processing operations and is quite good at alteration detection while maintaining image quality. This method is very useful in the scope of image forensic studies, copyright and input verification.

Keywords: Visual cryptography, watermarking, image forgery detection, image forgery localization, cryptographic shares, digital forensics, content authentication, copyright protection, image integrity, tamper detection, invisible watermarking, robust watermarking.