Security analysis and improvement of DWFCAT

Abstract

With the rapid development of Internet technology, the copyright protection and authentication of multimedia data have attracted more and more attention. Recently, a dual watermarking framework for industrial image content authentication and tampering localization (DWFCAT) has been proposed, in which the main innovation is the double encrypted robust watermark is embedded into the transform domain by exploiting the DCT energy compression characteristics and block coefficient correlation mechanism, the fragile watermark is embedded in the spatial domain to ensure data authentication and tamper location. However, through security analysis, we found that DWFCAT has security holes, the dual encryption algorithm of the robust watermarks cannot resist KPA attacks and prevent robust watermarks from being damaged, stolen, and replaced, even when the fragile watermark is unaware. Theoretical analysis and simulation results verify the effectiveness of the method. To improve the security of the original watermarking scheme and the ability to tampering with location, and restore the robust watermark that has been tampered with, an improved scheme is also given in this paper.