Research On Flash Animation Watermarking Tecjhnology Based On SWF Tag Features

With the development of network communication and the advancement of information technology,digital media has become the main carrier for people to share on the network.It is a form of communication that is simple,intuitive and easy to operate,rich in information and widely used,but the following information security issues are not uncommon.At present,information hiding is one of the research hotspots in the protection technology of digital media.Digital watermarking technology is a new steganography,which plays a key role in the future copyright disputes by steganography of copyright mark in the carrier.However,in the field of digital media,the research on digital watermarking technology is uneven.The research on image,audio and video has become more mature.But the research on digital watermarking of Flash animation is still rare.Therefore,for this widely spread in the network of Flash animation,its watermarking technology research is urgent.At present,the traditional protection method for Flash animation has been unable to play an effective protection,easily cracked and restored.While the research on digital watermarking technology is not mature,many watermarking algorithms have defects in concealment,security and robustness.And the embedding position is relatively simple.In order to make the copyright protection of Flash animation effective and practical,this paper proposes a watermark embedding algorithm based on the tag attribute feature of flash animation files and designs a watermarking system for Flash animation.In this dissertation,several embeddable tag attributes are selected,and a variety of spatial watermarking algorithms are designed according to different characteristics.The proposed method improves not only the hidden capacity of the carrier file but also the concealment of the watermark.Before the watermark is embedded,in order to improve the security of the watermark,the watermark information is pre-processed,and the Hamming error correction coding is used to extend the signal to expand the watermark capacity.Then the logistic chaos technology is used to scramble the watermark signal to resist some tampering attacks,so as to obtain the final watermark information sequence to be embedded.Next,according to the characteristics of tag attributes,different embedding algorithms are designed.For tags with a majority of bits,the classification algorithm is used;for tags with low sensitivity,the parity statistical algorithm is used;and a variety of algorithms can be combined to improve the security and robustness of the algorithm.The watermark information is embedded multiple times according to the scrambled embedding order to ensure the accuracy of the results.In addition,for animated files that contain secret information,the extraction order is obtained using the key first,and then the watermark information is restored according to the tag feature extraction algorithm.Finally,the original watermark image is obtained by anti-scramble with keysIn the end,combined with the watermarking algorithm based on the tag feature,the watermarking application system is designed.The user can use this system to complete the watermark embedding and extracting operation of the animation file,and to test the anti-attack performance of the animation file.The user can also batch the above functions as needed.The experimental results show that the proposed watermarking algorithm based on tag features can increase the hiding capacity by more than 30%compared with similar algorithms,the hiding capacity is significantly expanded.It can resist about 5%random tampering attacks,and has improved performance indexes of concealment,security and robustness.In addition,the watermarking system designed in this paper also has good practicability.