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1、IEEEJournalofSelectedAreasinCommunications,16(4):474-481,May1998.474SpecialIssueonCopyright&PrivacyProtection.ISSN0733-8716.OnTheLimitsofSteganographyRossJ.Anderson,FabienA.P.PetitcolasAbstract
2、Inthispaper,weclarifywhatsteganographyisisdead"tofatherisdeceased,"whichelicitedthereplyan
3、dwhatitcando.Wecontrastitwiththerelateddisci-sfatherdeadordeceased?"[24].plinesofcryptographyandtracsecurity,presentauni edterminologyagreedatthe rstinternationalworkshoponThestudyofthissubjectinthescienti cliteraturemaythesubject,andoutlineanumberofapproaches
4、manyofbetracedtoSimmons
5、,whoin1983formulateditasthethemdevelopedtohideencryptedcopyrightmarksorse-risoners'Problem"[44].Inthisscenario,AliceandBobrialnumbersindigitalaudioorvideo.Wethenpresentaareinjail,andwishtohatchanescapeplan;alltheircom-numberofattacks,somenew,onsuchinformationhidingschemes.Thisleadstoa
6、discussionoftheformidableobsta-municationspassthroughthewarden,Willie;andifWillieclesthatlieinthewayofageneraltheoryofinformationdetectsanyencryptedmessages,hewillfrustratetheirplanhidingsystems(inthesensethatShannongaveusageneralbythrowingthemintosolitarycon nement.Sotheymusttheoryof
7、secrecysystems).However,theoreticalconsider-ationsleadtoideasofpracticalvalue,suchastheuseof ndsomewayofhidingtheirciphertextinaninnocuousparitycheckstoamplifycovertnessandprovidepublickeylookingcovertext.Asintherelated eldofcryptography,steganography.Finally,weshowthatpublickeyinform
8、ationweassumethatthemechanisminuseisknowntothewar-hidingsystemsexist,andarenotnecessarilyconstrainedtothecasewherethewardenispassive.den,andsothesecuritymustdependsolelyonasecretkeythatAliceandBobhavesomehowmanagedtoshare.Keywords
9、Cryptography,Copyrightprotection,Datacompression,Image
10、registration,Jitter,Motionpictures,Therearemanyreallifeapplicationsofsteganography.Multimediasystems,Music,Observability,PseudonoiseApparently,duringthe1980's,MargaretThatcherbecamecodedcommunication,Redundancy,Spreadspectrumcom-soirritatedatpressleaksofcabinetdocumentsthatshemunicati
11、on,So
