坐標(biāo)集合中的水印隱藏算法設(shè)計(jì)與實(shí)現(xiàn).pdf

1、北京郵電大學(xué)碩士學(xué)位論文坐標(biāo)集合中的水印隱藏算法設(shè)計(jì)與實(shí)現(xiàn)姓名：汪濤申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：密碼學(xué)指導(dǎo)教師：楊義先20030301Abstractinformationhidingtechniqueshaverecentlybecomeimportantinanumberofapplicationareas.Digitalaudiovideoandpicturesareincreasinglyfurnishedwithdistingui

2、shingbutimperceptiblemarkswhichmaycontainahiddencopyrightnoticeorserialnumberorevenhelptopreventunauthorizedcopyingdirectly.Therearetwoimportantsubdisciplinesofinformationhiding:SteganographyandDigitalWatermark.Theformer

3、isaboutconcealingtheexistenceofamessagewhilethelatermainlyconcernsovercopyright.Bynowsteganographyordigitalwatermarksinthedigitalmedialikepicturesaudioandvideohavebeenwidelydiscussed.Althoughthesemethodsarefarfromperfect

4、awiderangeoftechniquesareproposedandusedinanumberofapplications.ButsomeabstractmediaalsoconcernsaboutthecopyrightsuchasdigitalgeographydatascientificresearchdataCADdata.etc.Therearerelativelyfewtechniquestoprotectthem.In

5、thisdissertationwewillpresentseveraldigitalwatermarkschemesthatcanbeimplementedinthiskindofmedia.Forthesimplicityofdiscussionwewillmainlydealwithaspecifickindofdataform:geographymap.Supposethedataismadeupofthousandsofpoi

6、ntsandeverypointconsistofanxcoordinateandycoordinate.Alsosupposethatthereisnoguaranteeabouttheorderofthepoints.Wewillfirstcheckthosepopularinformationembeddingmethodsanddiscussthepossibilityoftheirapplicationsinthisspeci

7、fickindofdigitaldata.Thenwewillchoosethestatisticwatermarkmethodandanalyzingthemostfamousstatisticwatermarkscheme:Pitasschemewhichgiveusagreatinsightovertheproblem.Nextwewillproposeourwatermarkschemesindetails.Wewillpres

8、entthreediferentschemesandanalyzingtheiradvantagesanddisadvantagesrespectively.ThenwewillchoosethegoodschemesandimplementtheminClanguage.Finallytheexperimentalresultsshowthatourwatermarkschemesmeettherequirementsofourdes