Research On Fragile Watermark Image Authentication Based On Chaos And Slant Transform

Nowadays, digital multimedia technology in the continuous rapid development, online video, audio and image information after another, between mankind inadvertently entered the digital age. The digitized information to people’s live, learn and work provides a lot of convenience, such as convenience store, easy publishing, easy access and so on. However, some potential dangers attendant. For example, criminals purposely tampering by malicious dissemination of information, leading to the incalculable consequences for individuals and countries.In order to protect the information security of computer networks, resulting in a digital watermarking technology, and digital watermarking technology has been more and more attention. People through effective methods of digital watermarking authenticity certification. There cryptography method, a digital watermarking method, digital digest method and other methods usually people applied.The digital watermarking technology in this context, the paper systematically digital watermarking technology were reviewed, discussed the background and dynamic authentication watermark authentication watermarking focuses on classic algorithms, and usual chaotic sequence and its encryption principle. Given the characteristics of the chaotic sequence and transform domain, this paper proposes a transform domain based on chaotic and fragile watermarking image authentication methods. The algorithm uses a two dimensional discrete Henon mapping after rearranging the sequence generated with watermark XOR, complete watermark encryption. The original image does not overlap the 8* 8 block by Slant transformation, the watermark is embedded into the transform domain after pretreatment. By tampering verification algorithm can effectively detect the image certification and positioning. Experiments show that the algorithm improves the calculation speed, effectively improve the security of the algorithm, and the general noise and JPEG compression, geometric attacks, which are robust.