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1、828IEEETRANSACTIONSONMULTIMEDIA,VOL.7,NO.5,OCTOBER2005DesignofIntegratedMultimediaCompressionandEncryptionSystemsChung-PingWu,Member,IEEE,andC.-C.JayKuo,Fellow,IEEEAbstract—Twoapproachesforintegratingencryptionwithdatausuallycontainsamuchlowerinformatio
2、ndensitythantextmultimediacompressionsystemsarestudiedinthisresearch,i.e.,datasothatencipheringschemeswithasignificantlylowercom-selectiveencryptionandmodifiedentropycoderswithmultipleputationalcostarefeasibleanddesired.Moreover,theencryp-statisticalmodel
3、s.First,weexaminethelimitationsofselectivetion/decryptionspeedisoftencriticaltomultimediacontentsbe-encryptionusingcryptanalysis,andprovideexamplesthatuseselectiveencryptionsuccessfully.Tworulestodeterminewhethercausereal-timeprocessingisrequiredinsomea
4、pplications.selectiveencryptionissuitableforacompressionsystemareSomemayarguethattoday’sdesktopcomputersarefastconcluded.Next,weproposeanotherapproachthatturnsen-enoughtoperformbothmultimediacompressionandtotaltropycodersintoencryptionciphersusingmultip
5、lestatisticalencryptiontogetherinreal-time,whichmeansthatthetotalmodels.TwospecificencryptionschemesareobtainedbyapplyingthisapproachtotheHuffmancoderandtheQMcoder.Itisencryptionmethodisgoodenoughfordesktopmultimediashownthatsecurityisachievedwithoutsacr
6、ificingthecompres-applications.Whilethismaybetrue,thereareemergingappli-sionperformanceandthecomputationalspeed.Thismodifiedcationsinmobilecomputingandserver-endcomputing.Theentropycodingmethodologycanbeappliedtomostmoderncomputingspeedofhandhelddevicesma
7、ynotbefastenoughcompressedaudio/videosuchasMPEGaudio,MPEGvideo,andfortotalencryption.Forserver-endcomputing,aserverhastoJPEG/JPEG2000images.handlehundredsofprocessesatthesametime.ThereductionIndexTerms—Confidentiality,CELP,entropycoder,G.723.1inthecomput
8、ationalcostofeachprocesswouldallowmorespeechcoding,Huffmancoding,multimediaencryption,selectiveencryption,signalscrambling,QMcoder.processestobeexecutedinparallel.Infact,therearespecialservers[4]designedtohandleencryptionanddecry
