基于Linux防火墻的內(nèi)部郵件監(jiān)控與阻斷系統(tǒng)的設(shè)計(jì)和實(shí)現(xiàn).pdf

1、南開大學(xué)Y8如8D5碩士研究生畢業(yè)(學(xué)位)論文姓名：年級：專業(yè)：研究方向：論文題目：完成日期：導(dǎo)師：鰲壁型2002級鹽簋機(jī)應(yīng)用技盎鹽簋墊旦堡生籃墾亟墮基士墾i業(yè)!墮盤擅煎凼疊堅(jiān)壁些蕉蘭墮塹亟絲煎選鹽壟塞堡2魚壁量生壘旦喹建壘劐塾握南開大學(xué)信息技術(shù)科學(xué)學(xué)院二零零五年pq月二十日采終作者、囂哿R駑勿盒宜麓奄AbstractDesignandImplementationoftheEmailMonitoringandBlockingSystem

2、basedonLinuxFirewallAbstractTheriskstoinformationsecurityincurredbyEmailsarethedisclosureofinformationandthewasteofnetworkresourceConsequentlysendinginneremailsbringsgreatrisktocorporationsTherearetwokeyaspectsthatguaran

3、teetheinformationsecuritynamelythetechniquesandmanagementofinformationsecurityFromtheangleofmanagement，therisksareinevitable，sincealmostallcorporationsallowemployeestosendexternalemailsFromtheangleoftechniques，theresearc

4、hesonSTMPprotocolareincreasinglybecomingpopularbutnomaturemechanismofmonitoringwebemallscomesfonllHencetheresearchonmonitoringemailsstillhassignificanceAimingateliminatingoralleviatingtheriskproblemofinnerE—mails，thispap

5、erproposesanInnerEmallMonitoringSystemOEMS)whichbasesonLinuxfirewaUIEMStakesLinuxOSasadevelopplatform，takesLinuxfirewalltechniqueasamaintechnologysupport，andUSeSnon—recoveringmethodtomonitorEmailsBasedontheanalyzingdiffe

6、rencesbetweenwebmalltransferprotocolandSMTPthispaperpresentstwodifferentmethodstodealwiththewebmallsandSMTPmails，respectivelyIntheusualmethod，theprocesstomonitorEmailstakestwostepsFirst，recovertheprotocolstackofEmaildata

7、gramSecond，monitortheEmailafterreceivethewholecontentoftheEmallComparedwiththeusualmethod，IEMSmonitorstheEmailIPdatagram，henceshortensthetimeofprocessingnetworkprotocolstackIEMSfocusesonmonitoringthetextcontentoftheEmail

8、TojudgewhethersomeinvalidinformationexistintheEmails，IEMStakesmultikeywordsmatchingalgorithmtoscanthetextcontentInordertosolvehowtodealwiththeconjointinformationbetweentwodatagram，thispaperpresentsanideacalledinformation