Chaos based invertible authentication of medical images

Digital image watermarking is used as a data hiding method to enhance medical confidentiality, integrity and data security. Extreme care should be done in medical image watermarking because the added additional information should not degrade the image quality. In this paper we are presenting a fragile and reversible watermarking based on chaotic key. ROI and NROI part of image are separated and data is embedded in NROI part of image based on a chaotic key. Image quality is measured with a well known figure-of-merit such as PSNR. Our results show that the watermark is highly secure, fragile and imperceptible after embedding.