數(shù)據(jù)庫外文翻譯

DesignandImplementationofSMSSecuritySystem

forWirelessEnvironmentYan-Ha1,Hea-SookPark1,Soon-MiLee1,Young-WhanPark1,andYoung-ShinHan2Abstract.Thispaperaimsatdevelopingcommunicationmoduleandapplicationprogramforclientmanagementmoduleanddevelopingdatabasemanagementmoduleandmanagingwirelesscommunicationfacilitiesforserversystems.Toconstructtheseaims,wehaveadaptedDESalgorithmandresearchedonencryptinganddecryptingmoduledevelopmentapplicabletoSMSSecuritySystemandoptimizemodulesizeandprocessingspeed.Inaddition,theXMLtechnologyisappliedtoencryptonlythecontentsofthemessageinawaytoreducethevolumeofdatatoprocessandshortenthetimetoencrypting.Introduction1.1BackgroundoftheStudySMS(ShortMessageService)isatwo-waymobiledatacommunicationserviceformobile(cell-phones,PDA)mayexchangeshortmessageswithoutadditionalequipment.SMSiswidelyuseddomesticallyduetotheaccuracyandpromptnessandotheradvantagesofSMS,andGSM(GlobalSystemAssociation)reportedthat19billionmessagesweretransmittedpermonthworldwidelastyear.Inaddition,theon-goingresearchesarefocusingonthesystemresearchanddevelopmentforM-CommercebyusingtheadvantageofSMSunderthemobileInternetenvironment.However,therearestillinsufficienteffortsinresolvingtheshortageofSMS,theissuesofsecurity(exposingoralteringthemessage).Theseshortagesmaybecomethefactorsininterferingwiththesafee-commerceenvironment.Therefore,ifthesecurityofSMSisstrengthenedtoremovetherisksoninformationexposureandalteration,itwouldbeappliedeffectiveontheareasofservicesonorderofgoodsforM-CommerceandE-Commerce,proceedpayment,confirmationofpayment,forwardingofelectronicreceiptandothers,servicesonbalanceinquiry,transfer,introductionofnewfinancialproductonmobileinternetbankingservice,andservicesonvariousauctionservice,reservationservicearea.Inthisthesis,inordertopresentthemessageexposurebyathirdpartyandensuringalterationofmessagesfromtheSMtransmission,thesecuritysystemforSMSwiththebasisofapplyingtheencryptiontechnologyistobedeveloped.Forthispurpose,theDESalgorithmistobeappliedwiththeappropriatealgorithmtousethesmallresourceofmobiledeviceeffectively.Furthermore,thisthesisappliedtheXMLwhenencrypting/decryptingofthemessages.TheadvantagesofapplyingXMLare,first,whichthevolumeofdatatoencrypt/decryptdecreases.Therefore,itreducesthetimerequiredanduseofthesystemresourceless.Second,intheeventthattheinformationofthepartnotencryptedisrequired,thenecessaryinformationmaybeusedwithoutthedecryptionprocess.ExamplesarethesenderID,receiverID,sendingdate,andtitleofmessageandothers.Third,theencryptedpartisnottobeparsingpriortodecryptthattheefficiency.RelatedStudiesSMSrelatedresearchesaremainlythestudiesonsystemstructuring.That,onthesystemtodeliverthestockinformationwithvoiceisdevelopedanditdesignedtheVoiceXMLservermoduleforstockinformation,SMSservermoduletoperformtheauthenticationprocedure,thePSTNnetwork,CTImoduleforinterfaceandothers.Atthistime,theSMScertificationbasedonrandomdisposablepasswordisattemptedasforthemethodofcertification.From,theexistingSMSisdesignedtooperateonthemainmemorydatastructurethattheDBMSconceptisappliedtopointoutandsupplementtheshortcomingsofrecoveryfunctionsimultaneouscontrolfunctiondeficiency.OnthePGPisappliedontheweb-basede-mailservicesystemtoimprovethesecurity,andusetheappletandsubletcommunicationmethodusingthejavalanguagetoresolvethesecurityissuebetweentheclientandserver.Atthistime,inordertoencryptthemessage,itappliestheIDEAalgorithmofsecretkeymethod,andatthistime,theRSAalgorithmofopenkeymethodisappliestoencryptthesecretkey.proposedthesafeinstantmessengersystemthatanindividualuserencryptstheindividualinformationthatissenttothemessengerserver,andselectivelyencryptstheinformationdeliveredbetweentheuserstoresolvethepotentialsecurityissues.And,thesystemdesignismadeonthebasisofdiffusedprocessingenvironmentbytheJAVARMIthatsavesthecommunicationoverheadcomparingtotheclient-serverstructure,andtheDESencryptionalgorithmisusedfortheencryptionoftransmitteddetails,andtheexchangeoftheDESencryptionkeyusestheDiffie-HellmankeyexchangemethodandtheRSAencryptionalgorithm.TheDesignandImplementationofSMSSystem3.1SecurityRequirementsofSystemInthisthesis,thesecurityrequirementneededtothesystemunderthemobileenvironmentispresentedasfollows.First,inordertomaintaintheconfidentiality,thesecretkeyusestherandomnumbergeneratortogenerate1024bitsofrandomnumbers,andinordertokeepthesecretkey,itusestheDiffie-Hellmankeydistributionalgorithm.Second,intheeventthereceivergetsthemessagewhendesigningthedatabaseforthenon-repudiationfunction,itshallbeabletoconfirm.Third,forthemobileauthenticationanduserauthentication,thedatabaseisdesignedaccordingly.3.2StructureofSystemTheentirestructureoftheSMSsystemisliketheFig.1.Theclientperformsthefunctionsofmessagemanagementandtransmission,userandgroupmanagement.Iftheclientwishestotransmitthemessage,itlogsinontheserver,preparesandencryptsthemessageandtheencryptedmessageistransmittedtotheserver.Themessagepreparedatthistimebecomestheencryptionwiththesecretkeyoftheclient.Ifanotherclientreceivesthemessagesfromtheserver,receivetheencryptedmessageafterloggingin.Themessageencryptioninitsownsecretkeyisdecrypted.Themessagemanagementfunctionofserverislargelydividedintotwostages.Serverdecryptstheencryptionmessagetransmittedfromtheclient,thenencryptsagainwiththesecretkeyofthereceivertostoreinthedatabase.Servermakesthecontentsoftransmittingmessagesunabletoread.Ifthereceivingclientwantsthemessagereception,theencryptedmessageisforwardedaftertheclientcertification.Atthistime,thesecretkeyoftheXMLManagerencryptsthemessage.Ifthereceivingclientwishestoreceivethemessagefromtheserver,loginfirstandthenusetheindividualsecretkeytodecrypttheencryptedmessage.ImplementationTheserverofthedevelopedSMSsecuritysystemisimplementedonthecomputerwithIntelPentiumIV2GHz256DDRRAM,andthedevelopmenttoolisusedofVisualStudio6.0.And,inordertodeveloptheclientprogram,theEmbeddedVisualStudio3.0andPocketPCSDKareusedontheabovePC.And,inordertotesttheprogram,theserverprogramdevelopedfromtheabovePCisimplementedandtheWinCEimplementstheclientprogramontheCompaqIPAQusedastheOS.4.1ClientImplementation4.1.1ClientMessageReceptionFunctionFig.2istheinterfaceofClienttoreceivethemessages.Throughtheseinterface,thereceivedmessagemaybereadorprocessed.

ReadMewMcooaack1-!-i；nnrifbtli)whnfalitlA1IrtWHITiAAlit1m祐pfim-1t-t1{.ihFfcr.k-^■1i|j^irkTud L?lli11>|200B-1I：-17T\IujsmleewhiIatoda^meeting!trAr.isi^Arl1pi..2Oty11i/T-t7NoNr.胃1I?Fig.3.TransmissionofMessage4.1.2MessageTransmissionFunctionFig.2.DecryptedandReceivedMessagesFig.3showstheuserinterfacetoforwardnewmessages.Throughthisscreen,themessageistransmittedtotheentiregroupdesignatedortooneparticularuser.Atthistime,pressthetransmissionbuttontoforwardthemessagethatisinputtedonthe“content”windowisencryptedontheDESalgorithmbyusingthe“userpassword”oftheuser.TheexampleofamessageinputtedthroughtheuserinterfacetoaXMLdocumentformisshowninTable1.Fig.2.DecryptedandReceivedMessagesTable1.XMLDocument5ioii=111.0"E,iicocliiig="eiic-ki11?><msginfo><Nuir>Se_0001N</Nnin><Senci_ID>edpsphs<JSend_ID><Rec\_ID>wrliite</RecvID><Recv_GiTnip>sni5</Rec\_Girmp><:M3g_Title>FiClpaperandregisuatioui</Mss_Title><Msg>Fullpape-randirgisU'ationaiT-duebyJanuary31.2004.<7Msg><Send_Date>2003-l1-17</Send_Datr>TheXMLdocumentthatencryptedtheXMLdocumentofTable1isthesameasTable2.Table2.TheEncryptedXMLDocument<Qxinlvcrsian="1.0'encodiiig=''euc-kr"?><DocEncn|)teclElenientaLgoritlmi="DES/CBC<PKC：S?Padcthig"contentTxpe="trxt/xinl”encodings"base64"iv=TPjfzihsNvA=1,>AtIvI4n+GOoo6pA\^7)dNJyZY4AD4Tt6Q/fitiBJS7FaKjouxDjyBH^v==</D□cElicrptedElentent>5sginfo><：Num>Se_0001N</Nuitl><Send_ID>€dpsplis</Seiid_ED><Rrcv_ID>whLte</Recv_ID><Rccv_GLOUp>sms</Recv_Group><EnciptedElenientalgod血站DES/CBC/PKCS5Padding"conteutType=,Jtext/xturencodingsHUase64''ivlucTPbRXyMY='>NfPTROLpBJR4aE5?biMiiJiYaOjaluMAIcdGPOpiFKysO\v=</Encrx'pteEleiTL€iit><Send_Date>2OO3-l1-17</Sencl_Date>C/insginfoA

Table3.ComparisonWithOtherMessengerSystemComparedItemMessengerSystemSMSSystemSystemwitli-□m 5ecuric\:tunctionSystempro-vidiii呂號cnrityfkmctionSystem^'ithoutsecinit\TfimctioiiSysteuipnn^idingsecmitvTfnncHonIniplenientedSystemICQ[11].MSN[12].UIN[13]MaXIM[14]ManySysteuipurposedinthissnidyApph^iii^Al^oritliinNoneRSA.DESNoneDESXMLSecurityNotsupportedNotsuppoi'tedNotsuppoiledSupportedMessageConfidfntialiry7NotsupparirdSuppoiiecLNorsupportedSupportedSenderAutluenticationNotsupportedSupportedNotsupportedSuppliedDBStoi-a9；eFunctionNot￡1耳）卩ortedSuppoiled.NotsupportedSupportedMobilityNotsiipportedNotsupportedSuppm:te-dSupportedEquipnentDesktopDesktopPDA.MobilePhanfPDA.MobilePhoi疋4.2ServerImplementationWhentheserverprogramisimplemented,itgeneratesthescreenasshownonFig.4.Theservermanagermayconfirmthesender,receiver,groupID,message,sentdate,receiveddateandothersrelatedtothewaitmessagethroughthisscreen.Inaddition,theservermanagermaydeletetheunnecessarymessagesfromthedatabase.Atthistime,themessagedisplayedonthescreenisencryptedthattheservermanageralsoisnotabletoconfirmthemessage.FilsFrlltRfinnrrlVIrwIInfnfMnnssgnr：FilsFrlltRfinnrrlVIrwIInfnfMnnssgnr：Delatethes@Is：匚t<sdmB^s曰geDeistsallmessagesViewthesel@cti&dmessageFig.4.ApplicationofServerSide4.3ComparisonwithOtherMessengerSystemThisstudyisastudyproposedtoovercometheshortcomingsinthesecurityaspectcomparingtothepossibilityofutilizationfortheSMSsystemthattheintentistoevaluatethefunctionalaspectsrelatedtothesecurity.ConclusionandFurtherStudiesInthisstudy,safemessageuseenvironmentisimplementedbyapplyingthesecuritytechnologyontheSMthatisbroadlyusedunderthemobileenvironmenttoday.Forthispurpose,itappliesthesecurityalgorithm,DES,ofsymmetrickeymethod,andimplementstheSMS.SMSisconsistedofDBservermodule,encryption/decryptionmoduleandserverinterfacemodule.AnditisdesignedandimplementedbyencryptingthemessagepreparedbythesendertostoreinthedatabaseoftheSMSserver,andperformthereceptionanddecryptionofthemessagebythereceivingparty.SMSthatisdevelopedbythisstudyisevaluatedassatisfyingallsectors,suchasmessageconfidentiality,senderauthentication,mobilityandotherswhencomparedtotheothermessengersystems.ThesystemimplementedbythisthesisisevaluatedasapplicabletomanyfieldsservicedunderthemobileInternetenvironment.Inparticular,theXMLtechnologyisappliedwhenencryptingmessage,itencrypts/decryptsonlythecontentsofthemessagetocutdownthevolumeofdata.Itincreasestheconveniencetoconfirmthecontentsnotencryptedwithoutdecryptentirevolume.設(shè)計(jì)和實(shí)現(xiàn)短信安全系統(tǒng)的無線環(huán)境Yan-Ha1,Hea-SookPark1,Soon-MiLee1,Young-WhanPark1,andYoung-ShinHan2摘要本文旨在發(fā)展通訊模塊和應(yīng)用程序如客戶管理模塊，開發(fā)數(shù)據(jù)庫管理模塊和管理無線通信設(shè)施服務(wù)器系統(tǒng)。為了達(dá)到這一目標(biāo)我們已經(jīng)改編了DES算法使它適用于短信安全系統(tǒng)的加密和解密模塊、優(yōu)化模塊尺寸和處理速度。此夕外XML技術(shù)只應(yīng)用到信息內(nèi)容的加密減少了大量的數(shù)據(jù)處理,縮短時(shí)間加密。1.介紹1.1研究背景SMS（短消息服務(wù)）是移動（手機(jī)、PDA）的一種雙向移動數(shù)據(jù)通信業(yè)務(wù)，不需要其它的設(shè)備就可以交流短信。由于SMS的準(zhǔn)確性、快捷等優(yōu)點(diǎn)國內(nèi)廣泛使用手機(jī)短信，GSM（全球系統(tǒng)協(xié)會）報(bào)道,去年全球每月轉(zhuǎn)發(fā)短信190億。此夕,主要研究的系統(tǒng)和開發(fā)的移動電子商務(wù)所利用的SMS是在移動互聯(lián)網(wǎng)的環(huán)境內(nèi)的。然而,在解決短信的問題上的努力仍有不足,安全問題（的暴露或改變）。這些問題因素可能會破壞電子商務(wù)環(huán)境的安全。因此,如果短信服務(wù)更強(qiáng)健了信息暴露和改造的被移除了,它就會被服務(wù)領(lǐng)域有效的采用,如移動商務(wù)、電子商務(wù)中的貨物訂購，支付,確認(rèn)付款、電子發(fā)票的簽收等。總而言之關(guān)于銀行服務(wù)的新的移動金融產(chǎn)業(yè)如咨詢，轉(zhuǎn)賬，收入還有各種各樣的拍賣服務(wù)、預(yù)訂服務(wù)。在這篇論文中，為了呈現(xiàn)信息被第三方曝光以及信息在傳輸過程中確實(shí)被改變，SMS安全系統(tǒng)是以加密技術(shù)為基礎(chǔ)開發(fā)出來的。為了達(dá)到這個(gè)目的，DES算法在適用的算法中占用的資源較少用于移動設(shè)備比較有效。此外，論文在短信的加密/解密中采用XML技術(shù)。運(yùn)用XML的優(yōu)點(diǎn)：第一，它大量的減少了加密解密的運(yùn)算量。因此，可以減少運(yùn)算所需的時(shí)間和占用的資源。第二，信息中有些部分是不用加密的，當(dāng)然這些部分也不用解密。如發(fā)送者，收件者，發(fā)送日期，短信標(biāo)題等等。第三，信息是不能被前面的譯碼有效的解碼的。2.相關(guān)研究與SMS相關(guān)的研究主要是系統(tǒng)的構(gòu)建。系統(tǒng)采用聲音的方式傳送貨物信息已經(jīng)十分發(fā)達(dá)并且開發(fā)了XML貨物信息服務(wù)模塊，SMS服務(wù)模塊執(zhí)行程序的認(rèn)證，網(wǎng)絡(luò)的連接，CTI接口模塊等等。同時(shí)，SMS認(rèn)知是基于一次性密碼認(rèn)證的方法認(rèn)證的?，F(xiàn)有的短信是被設(shè)計(jì)用于主存數(shù)據(jù)結(jié)構(gòu)數(shù)據(jù)的，用數(shù)據(jù)庫概念可以于指出并恢復(fù)SMS功能的不足改善同時(shí)控制功能存在的缺陷。應(yīng)用PGP互聯(lián)網(wǎng)電子郵件服務(wù)體系增加安全性,同時(shí)使用小程序底層通訊和java語言來解決客戶端和服務(wù)器之間的安全性問題。同時(shí)，為了給信息加密，使用算法密鑰的思想方這里使用RSA算法為公開的密碼加密。提出的即時(shí)通信系統(tǒng)是每位用戶加密后發(fā)送給服務(wù)器,選擇性的加密信息在用戶之間傳遞可以解決潛在的安全問題。系統(tǒng)基于JAVA，RMI所編的散處理環(huán)境比客戶端-服務(wù)器更節(jié)約空間，DES加密算法加密了傳輸?shù)募?xì)節(jié)，交換密鑰時(shí)使用、使用diffie-hellman關(guān)鍵方法和RSA加密算法。3.SMS系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)系統(tǒng)3.1系統(tǒng)的安全要求在這篇論文中,在移動環(huán)境下提出了對系統(tǒng)的安全需求如下。第一,為了安全，密鑰是1024位隨機(jī)發(fā)生器產(chǎn)生的隨機(jī)數(shù)字。并且為了秘鑰的安全，密鑰使用diffie-hellman密鑰分配算法。第二，如果得接收消息者的數(shù)據(jù)庫中,有設(shè)計(jì)的確認(rèn)功能,它才能確認(rèn)。第三，第三,手機(jī)認(rèn)證和用戶認(rèn)證、為數(shù)據(jù)庫的設(shè)計(jì)提供依據(jù)。3.2系統(tǒng)的結(jié)構(gòu)整個(gè)SMS系統(tǒng)的結(jié)構(gòu)如Fig.1Fig.1.SMS系統(tǒng)的結(jié)構(gòu)客戶端的功能是信息管理和傳播,用戶和組的管理。當(dāng)用戶想傳輸信息時(shí)，登入服務(wù)，準(zhǔn)備并加密信息并把加密信息傳送給服務(wù)器。此時(shí)用戶所準(zhǔn)備的信息變成了加密信息和密鑰。當(dāng)另一用戶收到了從服務(wù)器發(fā)來的信息，在他登入后就會收到加密信息。這信息在輸入

了密鑰后就可以解密。服務(wù)器的信息管理功能主要分為兩個(gè)階段。服務(wù)器解密客戶傳遞的加密信息，服務(wù)器使用接收者的密鑰加密信息并存入數(shù)據(jù)庫中。服務(wù)器使在傳輸過程中的信息時(shí)不可閱讀的。如果接收者想接收信息，在用戶同意后密文是可以轉(zhuǎn)發(fā)的。這時(shí)，XML管理者使用密鑰加密信息。如果接受者想從服務(wù)器接收信息，先登入在使用各自的密鑰解開密文。4.實(shí)現(xiàn)SMS安全系統(tǒng)的服務(wù)器需英特爾奔騰IV2GHzDDR256MB內(nèi)存的電腦，開發(fā)工具是VisualStudio6.0。為了開發(fā)客戶端程序，在電腦中裝入VisualStudio3.0和PCSDK。為了測試程序，服務(wù)器由上訴pc開發(fā)，用戶端在用wince操作系統(tǒng)惠普筆記本電腦上。4.1客戶端4.1.1客戶信息接收功能Fig.2是客戶端接收信息的界面，通過這些界面,收到的信息可能被讀或處理FlcadMowMcocaqcH&frcshkNiimhnri-innrirBrII)whIitlA1IrtW^TiA A1it1Jnfnpfim-i1-t11.IhPtr.k-V*^1ip^irkTud Lrtli11>i2003-11-17fxlusmEeewhitatodaj^meeting!t1■曰dzarl1pi..2￡JU3111/jnm-1T-17NoNr.’1I?D&leteMessageDeleteAHMessagesExitFig.2.信息的接收和解碼GSkmdi—iIO= 0FSec&iw&rID: iteIT'h^inkyouI1hiaverec-eived5^ourmness--aq&ri口wlIInvt=tn司wwmu-ltillIs=l吞”mm■rp壬打口n*Fig.3.信息的傳遞4.1.2信息傳輸功能的實(shí)現(xiàn)Fig.3顯示了用戶傳輸新消息的界面。更具屏幕顯示,信息可以傳送給整個(gè)小組或某一指定用戶。在這段時(shí)間,就是按下傳輸信息按鈕，在輸入窗口內(nèi)的內(nèi)容就會被加密，使用的是基于用戶密碼的DES算法的方法。例子是一條信息通過用戶界面轉(zhuǎn)換成XML文檔表格如Table1。Table1.XML文檔l e-ncoiliiig^Neiic-ki-''Q><msginfD><Num>S￡_00d1N</Nuin><3encl_ID>eipsphs<JSeacE_ID><Rec\_ID>^liite</RecvID><Rec\_Giion.ip>siiis</Re-c^_Gimtp><:Msg_Title>Fiillpaperandregisuarinn^</Msg_Ticle><Alsg>Fullpape-randltgisuationaircluebyJanuary31.2OO4.</Msg><Send_Datc>2003-11-17<7Send_Dare>相對與Tablel的文檔加密過后的XML文檔如Table2。Table2.加密后的XML文檔vcrsian=L.OencodiiiS="euc-ki'"?><DocEncn^)teclElenientalgantlun="DES/CBCfPK.CS5PadctmgcantentTxpe="trxt/xinl"encodiug="tiaset>4"i—"TPjfzihsNvA=1'>Athl4n+GOoo6pAXT\7)dNJyZY4.\D4Tt6Q/fibBJS7FaKjouxajyBHw==</DdcElictptedEleuient>*^tnsgiiifo>*：：Nuni>Sr0001N</Nuiil><Sencl_ID>edpspdis</Seiid_LD><Rjecv_ED>w]ute<7Recv_ID><Rtrcv_Group>siTLS</Rec\_Gioup>cEnciptedElenientalgoiitliiR=DES/CBC/PKCS5Paddmg'conteiitTy text/xinl''encodnig=HLase64'ivIircVPURXyMY='F>NfPTROLpBJR4aE55hMiiJiYaOjalaMMcdGPOpiFKysOAv=</EncrxpteELement><Sencl_Date>2003-11-17</Sencl_Date>

Table3.與其他短信系統(tǒng)的比較ComparedItemMesseneerSystemSMSSystemSystem吐ith-□ut securityftinctionSystempin-\MingsecurityfunctionSystemwithoutsecinityTUnctionSystemprovidingsecurityfunctionIiiiplenienteciSystemICQ[11],MSN[12].UIN[13]MaXIM[14]ManySystempioposedintliisstudvAppkpiiigAkoritlunNoneREA*DESNoneDESXMLS比urityNotsupportedNotsuppdtedNotsupportedSupportedMessageC□nfidentialitx7NotsiippottedSupposedNotsupportedSupportedSenderAutlirnticationNotsupportedSupportedNotsupportedSupportedDEEtoan罕FunctinnNotsi甲卩ortedSupposedNotsupportedSupportedMobilityNotsupportedNotsuppoiteclSuppai'tedSupportedEqiiipmentDesktopDesktopPDA.MobilePhonePDA.MobilePlione4.2ServerImplementation當(dāng)服務(wù)器程序執(zhí)行時(shí)，它會產(chǎn)生屏幕顯示如Fig4。對于等待的信息服務(wù)器管理者可以通過該屏幕確認(rèn)發(fā)送,接收、查看組身份、報(bào)文發(fā)送日期、收到的日期及其他相關(guān)信息。此外,服務(wù)器管理者可以從數(shù)據(jù)庫中刪除不必要的信息。當(dāng)然，服務(wù)器管理者屏幕上的信息時(shí)加密的，管理者也不能讀取信息。FilsFrllTRfii?nrrlVIrwLl￡tofMessages口咎FilsFrllTRfii?nrrlVIrwLl￡tofMessages口咎I弓耳曾th畔，早I?匚t啟dmessageDelm?百IImessage?th?導(dǎo)常1耳g■（牛dmessageFig.4.應(yīng)用服務(wù)器端4.3與其他短信系統(tǒng)的比較本文提出了關(guān)于利用SMS系統(tǒng)如何克服在安全方面的可行性比較。其目的就是評估相關(guān)層面功能的安全。5.結(jié)論與未來在這項(xiàng)研究中，如今，為了實(shí)現(xiàn)了信息安全技術(shù)廣泛用于SM移動環(huán)境下的信息使用的安全。為了這個(gè)目的，運(yùn)用DES安全算法、關(guān)鍵密鑰方法，并使用了SMS系統(tǒng)。SMS系統(tǒng)是由數(shù)據(jù)庫服務(wù)器模塊、加密/解密模塊和服務(wù)器接口模塊組成。并且它由發(fā)送人準(zhǔn)備的信息經(jīng)過設(shè)計(jì)加密傳入SMS服務(wù)器的數(shù)據(jù)庫中，而接收和解密信息是由接收者完成的。和其它的信息系統(tǒng)相比，開發(fā)的SMS系統(tǒng)在各個(gè)方面都是令人滿意的，如信息保密性，發(fā)送者認(rèn)證，移動性等等。本系統(tǒng)可以適用于許多移動互聯(lián)網(wǎng)環(huán)境下的服務(wù)領(lǐng)域。特別指出，XML技術(shù)用于信息加密，它只加密/解密信息的內(nèi)容可以減少大量的數(shù)據(jù)。它增加了認(rèn)證內(nèi)容的方便性沒有加密解密整個(gè)數(shù)據(jù)。ImprovetheGSMnetworkcapacityplanningWiththerapiddevelopmentofGSMmobilebusiness,andensuringthequalityofcommunicationsunderthepremiseofmaximizeGSMnetworkcapacityisalwaysnetworkoperatorssought-aftergoal.ThetraditionalmethodsofGSMexpansionisthebandsplitandexpansion,butnowgetnewspectrumresourcesthepossibilityisnotbig,inthecallcentersforinterferencewiththelimit,districtdivisionalsocrippled,soitismorecloselyfrequencyreusetechnology,establishingmicrocells/slightlyhoneycomb,constructionSM900/1800double-frequencynetworkandnetworkoptimizationsolutionGSMnetworkcapacityhasbecometheimportantmeans.1.DistrictsplittechnologyDistrictsplittechnologyistoincreasethecapacityofthenetworkcoursepreferredplan.GSMearlyarrangement,themainproblemistosolvethecover.Inthespectrumresourcesbounteousarea/period,alongwiththeincreaseoftheuser,butwilltheoriginaldistrictsplitintomorecoverageareaislesserareaorincreasethenumberoforiginaltransmits,soastoachievethepurposeofexpansion.Throughthevillagesplitortransmitsnew,overthebasestationnumber,number,numberofchannel,whichtransmits,traffic,subscribersareincreasedsubstantially.Improvetheutilizationratioofthecommunitydividedspectrumkeyliesintheareaofreducingtheunitarea.Choosedistrictsplitexpansionmethodshallcomplywiththefollowingprinciples:ensurethathasbuiltthebasestationcancontinuetouse;shouldholdthefrequencymultiplexingmethodofregularityandrepeatability;trytoavoidorreducethetransitionzone;toensurethatfuturemaycontinuedistrictdivision.Thesplitinthevillagetovillagetothemainmethods1:3anti-secessionlaw;Thesplitinthevillagetovillagetothemethodandtohave:"anti-secessionlaw;Thevillagefordirectionaldistricttosplitthemethodsare:1x3x4anti-secessionlawand1x6x3anti-secessionlaw;Directionaldistrictsplitthemethodfordirectionalhave:hexagonalsidecenteranti-secessionlawandhexagonalvertexanti-secessionlaw.2.TheexpansionandthefrequencybandclosemultiplexingtechniqueFrequencyband,ofcourse,istheidealofcapacityexpansionmethod,butinthecurrentcase,getnewspectrumisunlikely.Atpresentinthe900MHzbandunicom6MHzresources,inadditiontotheindividualthehotspot,cansatisfytheneedforbasic.TelecomGSMfiveperiodexpansionafterGSMnetsfrequencyrangefor:898.6-908.8MHz,total10.2MHz.TheexpansionplaninprincipleofAnetworkextendstothebandwillbe885.0125MHz,GSMnetsfrequencybanddownto14.4MHzexpansion,theuseof23-94numberfrequency.Atpresent,thetelecomGnetsbasestationinmanyareasalreadyverycrowded,partofthedistancebetweenthebasestationonly-meters,theappropriateselectionofhailhasmoreandmoredifficult.Thedistancebetweenthestandingtooclose,leadingtothesamefrequencyandadjacenttheincreaseoffrequencyinterference.Inaddition,thehighertheantennagain,therestrictedinthebeamwidthofthenarrow,ifstandtooclosetothedistance,themobileinantennabeamoftheLordtheprobabilityincreasegreatly.Inaddition,Anetsfrequencyshiftroomalsoisnotverybig,therefore,thespectrumofthespaceexpandisverylimited.However,duetotheGSMsuchasGMSK,balancedmodulation,mixedcodingmethod,especiallyalsoprovidessomeotheraimstoimprovespectrumefficiencytechnology,suchasfrequencyhopping,thecontinuousfiring,powercontrol,halfratechannel,diversityandmobileauxiliaryswitch,receive,soastoreducethenetworkofthesamefrequencyandadjacentinterferencesourceindexrequest,thefrequencyoftheclosereusepossible.hopping.Frequencyhoppingisaccordingtosomefrequencytransmitsjumpingintheseries,itincludesbasebandfrequencyhoppingandrffrequencyhoppingtwokinds.Frequencyhoppingroleistoprovidethefrequencydiversity,andimprovethesystemofanti-disturbanceability,resistancetodecline.Thecontinuousfiring.UsingDTXtechnology,mayreducethesystemoveralllevelofinterference.Powercontrol.Thisisalsoreduceinterferencesoastoimprovethecapacityoftheeffectivemeans.Halfratechannel.Thiscanmakethesystemcapacitydoubled.Diversity.Diversityhavevariousforms,usediversitytechnology,canimprovetheabilityofthesystemofdecline.ThecloserfrequencymultiplexingtechniqueInthespectrumoflimitedcircumstances,adoptmorecloselyfrequencymultiplexingmethodisundoubtedlyimprovesystemcapacityofoneofthemostdirectway.CanyouuseGSMfrequencymultiplexingmethodmainlyhaveliver:7villagemultiplexingmethod,4x3multiplexingmethod,3by3multiplexingmethod,4x3and3by3mixedmultiplexingmethod,2x6multiplexingmethod,1x3multiplexingmethodandConcentriccirclestechnologyandMultiplereuseMRPstyleandetc.sevenofthebasestationmultiplexingmethod:Thesevenbasestationareaforareusethereuseofthegroupusedinlowtrafficwayoruserdensitysmallerareas,forthegeneraltobasestation,theD/R=4.58,withfrequencymultiplexingdistanceisfarther.4x3multiplexingmethod:Thisis"900MHzTDMAdigitalpubliclandcellularmobilecommunicationnetworktechnologysystem"recommendedthereuseoftheway,andisalsothemostcommonandGSMsystemthemosttypicalmultiplexingmethod.Forclover60degreesantenna,theD/R=6;For120degreesantenna,theD/R=3.46theclover60degreeswhenwirelesswithfrequencyinterferencebetterperformance.3by3multiplexingmethod:Thisis"900MHzTDMAdigitalpubliclandcellularmobilecommunicationnetworktechnologysystem"recommendedthereuseoftheway.3by3multiplexingmethodandfrequencyhopping,DTX,powercontrolareusedtogether,withfrequencyinterferencerequirements.Butinthefollowing6MHzbandwidth,can'tprovideenoughfrequencyhoppinggain,sopoorperformance.2x6multiplexingmethod:ThisisMotrolaproposedtosolvehightrafficareasoffrequencyreusemethod.Themethodinthedirectionofthedifferentantennahasadifferentfrequencyreusedegree,theD/Rlessthan3by3multiplexingmethod.1x3multiplexingmethod:Thiswayisthemostcloselymultiplexingmethod,itsmainfeatures:Applicabletoanarrowfrequencyband,capacitymoreconcentrated,donotneedmanyofthebaseareas;ButinsmallerNumbersprovidelargerbasestationcapacity;Theneedtopartoftheloadingmethods,namelytransmitscan'tusefull,sendandreceivelettermachineforabouthalfthenumbersoftware-processable;Needtoadoptrffrequencyhopping,powercontrol,discontinuouslaunch,antennadiversitytechnologyetc,inordertoreduceinterference;Donotneedtochangetheexistingnetworkstructure.But,althoughthiswayfrequencyutilizationrateisveryhigh,butthesystemdisturbanceincreaseisverybig,ifuseanti-interferencemeasuresnoteffective,mayhavegreatinfluenceonthequalityofnetwork,soshouldbeusedwithcaution.concentriccirclestechnology:Technologyistheusualconcentriccirclesareadividedintoouterandtheinner,theouterlayerofthecoverageforthetraditionalcellularvillage,andtheinnercoveragearemainlyconcentratedinthebasestationnearby.Inaddition,insideandoutsideofthecoefficientoffrequencyreusearealsodifferent,outergeneraluse4x3multiplexingmethod,andtheinnerusedtheclosermultiplexingmethod,suchas3by3,2x3or1x3ways.Accordingtotherealizationoftheconcentriccirclesindifferentways,canbedividedintoordinaryconcentriccirclesandintelligentdoublenets(IUO)twokinds,theessentialdifferencebetweenboththelaunchoftheinnerpowerandinternalandexternallayerofswitchingalgorithm.Thelaunchoftheinnerordinaryconcentriccirclesofpoweringeneraltobelowouter,soastoreducethesamefrequencyinterference,whichgenerallyisbasedontheouterlayeroftheswitchpoweranddistance.AndIUOinsideandoutsideofthelayerarequitethesametransmissionpower,andbasedonC/Iswitch.Toimprovethecapacityofordinaryconcentriccirclesabout10%-30%orso,improvequantityisnotbig,IUOwaytoimprovetherelativelylargecapacity,aregenerally20%-40%,andcanimprovethecapacityinbasedonthecallqualityguarantee.MRPway:MRPwaywillallavailableisdividedintoseveralgroupstransmits,eachgroupasaseparatelayertransmits,thefrequencyofthedifferentlayerswithdifferentmultiplexingmethod,frequencyreuseclosestepbystep.ToensurethesafetyoftheBCCH,usedintheBCCHtransmitstheMRPnumbershouldnotlessthan12.AccordingtothedifferentmethodofgroupingTCH,MRPandcanbedividedintostrictMRPandimprovedMRP.MRPmultiplexingmethodhasthefollowingfeatures:Largecapacitycanbeimproved,in7.2MHzbandwidthcases,than4x3reuseimprovetherateof47%;Channelallocationflexible;Canreleaseasomefrequenciesusedformicrocells;Usingbasebandfrequencyhopping,easiertoachieve.InusingMRP,shouldpayattentiontothefollowingquestions:Mustusefrequencyhopping,powercontrol,suchasDTXanti-jammingmethod,thisalsoisthepremiseofMRPtechnologyapplication;UsingMRPtechnology,attentionshallbepaidtotheorderoffrequencydistribution.GenerallyshouldfirstBCCHdistribution,andthenTCH5distribution,thenTCH4distribution,untilTCH1;Differentareaofthebasefrequencyrespectivelyplanning;AccordingtothespecificinterferenceofadjustmentadjacentregionsSettings.Fromshenzhenandshandong,astheuseoftheland,wecanseetheMRPtechnologycanaccordingtocapacitydemandandtrafficdistributionforflexiblefrequencyplanning,butgraduallyimprovenetworkcapacitythanusingonly3by3reusenetworkcapacity,high,and1x