Image authentication technology based on semi-fragile scrambling watermarking

In order to distinguish the conventional image manipulation and malicious tampering more effectively , this paper implements an image authentication algorithm based on semi-fragile scrambling watermarking. The original image is firstly decomposed into pixel-based bit-planes, then the Arnold scrambled binary watermarking is embedded as a mask information into a particular bit-plane of original image. In the image detection side, the extracted watermarking is combined with a tamper assessment function to determine the credibility of image authentication. Experimental results show that the algorithm is robust to several conventional image manipulation like brightness adjusted, JPEG compression, salt and pepper noise ,and median filtering ,and which is simultaneously fragile to malicious tampering .The position of malicious tampering can be localized accurately.