Image authentication scheme based on reversible fragile watermarking with two images.

Image authentication receives growing awareness because digital images can be easily modified and the modification is hard to detect. A reversible image authentication method that can improve the accuracy of tamper detection and the quality of watermarking image is presented in this paper. In the proposed method, reversible data hiding is implemented with two identical host images, where the secret information is embedded in one host image while the distortion information is embedded in the other image. In the authentication process, we compared the information extracted from the image with the original authentication information to judge whether the image was tampered with. Experimental results show that the algorithm can improve the accuracy of tamper detection and guarantee the image quality while a large number of authentication information is embedded. [ABSTRACT FROM AUTHOR]