Research Of Text Watermarking Based On Chinese Phonetic Alphabets

Today,many studies about digital watermarking are focused on dynamicwatermarking,including audio,vedio and images.They have obtained the effectiveways and fruitful results with the large amount of redundant information which isconducive to load the watermarking,and the similar algorithm.However,the study ofthe static watermarking,especially the research in the text digital watermarking ismostly stagnant.The main reason is that,compared with the static watermarking,thedynamic watermarking has higher concealment and robustness,and more complexstructure.From the aspect of the current text digital watermarking’s research,thewatermarking algorithms which can be used in the market are few.During the recentyears,the research has been jogging on.Usually it’s hard to find the efficient balancepoint between the watermarking’s capacity,concealment and robustness.Besides thedomestic research in this aspect is limited and the improvement of the watermarkingalgorithm is confined to the foreign research.Thus the text watermarking researchbased on the Chinese phonetic alphabets’ structure is in space state.Chinese phoneticalphabets with its simple but special structure,is one of the important ways for us tolearn Chinese.According to its structure and the phonetic notation technology used inour daily life,the text watermarking based on Chinese phonetic alphabets is apotential research.Before writing this thesis,the author reads a great many books about Chinesephonetic alphabets’ evolution,and puts forward a kind of text zero-watermarkingmethod based on Chinese phonetic alphabets.This method based on the Chinesephonetic alphabets’ structure,according to the custom taking value rules,sets thecharacters’sequence corresponding with the number of Chinese phonetic alphabets.Atlast as the document feature content and watermarking information to be embeddedare encrypted and handed to the third party to be registered.It is the first time that theresearch focuses on the Chinese phonetic alphabets’ structure which transforms thecomplex characters into relatively simple phonetic alphabets’ form,therefore itmakes a good combination between Chinese phonetic alphabets and some merits ofzero-watermarking. At the end of the paper,the watermarking algorithms are largely tested and all itsproperties are tested with attacking experiments,which prove that this algorithm issufficient enough to deal with format attacking,malicious deletion and others.On theother hand,this watermarking algorithms successfully works out the contradictionamong its concealment,capacity and robustness,especially suitable to be applied toChinese watermarking’s loading.