电子商务英语 ECommerce English PPT 课件

5/26/2020,1,Unit11ElectronicCommerceSecurity,5/26/2020,2,Warm-upWordStudyTextAnalysisExercises,5/26/2020,3,Warm-up,ThefollowingfiguresarewhatyoucanseewhenyouclicktheVeriSignSecuredSealoneB.Itcanhelpyouidentifythesite.WhatdoyouknowaboutVeriSignandVeriSignSecuredSeal?,5/26/2020,4,Wordstudy,privacypraivsin.保密性Inthisplaceprivacyisimpossible.在这种地方保密是不可能的。integrityintegritin.完整性Thereisawholerangeofsecuritymeasuresavailabletoensuredataintegrity.有一整套可用安全措施来确保数据完整性。,5/26/2020,5,Wordstudy,authenticity:entisitin.真实性Istronglysuspecttheauthenticityofthedocument.我很怀疑该文件的真实性。non-repudiationnripju:dieinn.不可否认性Non-repudiationisoneoftheimportantquestionsofdevelopmentofelectronicbusinesssystem.不可否认性是开发电子商务系统必须要解决的问题之一。,5/26/2020,6,Wordstudy,encryptioninkripnn.加密Databaseencryptionisacoresubjectinthefieldofinformationsecurity.数据库加密是信息安全领域研究的一个核心课题。algorithmlgrimn.算法Letusstartwithanimmediateconsequenceofthealgorithm.我们先提出该算法的一个直接推论。,5/26/2020,7,Wordstudy,symmetricalsimetrikladj.对称的Heintroducedtousthesymmetricalarrangementofthegarden.他为我们介绍了花园对称的布局。encryptinkriptvt.加密Theconnectionattemptfailedbecauseofthefailuretoencryptdata.错误的加密数据造成连接请求失败。,5/26/2020,8,Wordstudy,decryptdi:kriptvt.解密Thespecifiedfileisencryptedandtheuserdoesnothavetheabilitytodecryptit.指定的文件已加密，而且用户没有能力解密。asymmetricalsimetrikladj.不对称的Mostpeoplesfacesareasymmetrical.大多数人的脸是不对称的。,5/26/2020,9,Wordstudy,Hashinghin.散列法，哈希算法ThesystemisnotabletoverifythissignaturebecauseitdoesnotsupporttheHashingalgorithm.系统无法验证此签名，因为它不支持哈希算法。identityaidentitin.身份Acreditcardisnotavalidproofofidentity.信用卡不是有效的身份证明。,5/26/2020,10,Wordstudy,authentication:entikeinn.证明，鉴定Identificationauthenticationserverprovidespasswordauthenticationanddigitalcertificateauthentication.身份认证服务器提供口令认证和数字证书认证两种方式。trustworthinesstrstw:inisn.可信任Iqueryhistrustworthiness.我对他的可靠性有怀疑。,5/26/2020,11,Wordstudy,identificationaidentifikeinn.身份证明Iusedmydriverslicenseasidentification.我用驾驶执照作为身份证明。unilateralju:niltrladj.单方的Theytaketheunilateraldecisiontocancelthecontract.他们单方面决定撤消合同。,5/26/2020,12,Wordstudy,repudiationripju:dieinn.否认Hisrepudiationofthetransactionwasunacceptable.他对交易的否认令人无法接受。vulnerablevlnrb()ladj.易受攻击的Thepotatoisvulnerabletoseveralpests.马铃薯易受几种害虫的侵害。incredibleinkredbladj.难以置信的ThatsthemostincrediblecoincidenceIveeverheardof!那是我听说过的最难以置信的巧合！,5/26/2020,13,TextAnalysis,RequirementsforElectronicCommerceSecurityIngeneral,thebasicrequirementsforelectroniccommercesecurityincludeprivacy,integrity,authenticityandnon-repudiation.,5/26/2020,14,TextAnalysis,PrivacyWhenamessageissentelectronically,thesenderandthereceivermaydesirethatthemessageisnotrevealedtoothers.Themosteffectivetechniqueforprivacyisencryption.Formuchofhistory,encryptionalgorithmsweresymmetrical,whichmeansthatthesamekeywasusedtobothencryptanddecryptamessage.Thedifficultyishowtohavethesenderandthereceiverwhowillprobablynevermeetagreeonakeythatcannotbeknownbyanyoneelse.(译文),5/26/2020,15,TextAnalysis,Forthisreason,anewtypeofalgorithm,calledpublickeyencryption,wasinvented.Publickeyencryption,alsoknownasasymmetricalencryption,utilizesapairofkeyspublickeyandprivatekey.Thepublickeyisavailabletoanyonewhowantstosendanencryptedmessagetotheholderoftheprivatekey.(译文)Theonlywaytodecryptthemessageiswiththeprivatekey.Inthiswaymessagescanbesentwithoutagreeingonthekeysinadvance.,5/26/2020,16,TextAnalysis,IntegrityAmessagethathasnotbeenalteredinanyway,eitherintentionallyorunintentionally,issaidtohavemaintaineditsintegrity.(译文)Aneffectivewaycalled“Hashing”canbeusedtoensuremessageintegrity.TheHashvalueofamessageiscomputedusingHashingalgorithmandcontentofthemessage.,5/26/2020,17,TextAnalysis,TheHashvalueissentalongwiththemessage,whenmessageisreceived,anotherHashvalueiscalculatedbythereceiverusingthesameHashingalgorithm.(译文)ThetwoHashvalues(receivedandcalculated)arecomparedandamatchwillindicatethatthemessagereceivedisthesameasthesentone.(译文),5/26/2020,18,TextAnalysis,AuthenticityWhenanelectronicmessageisreceived,theidentityofthesenderneedstobeverifiedinordertodeterminewhetherthesenderiswhoheclaimstobe.(译文)Oneofthemosteffectiveauthenticationmeasuresisdigitalcertificate.AdigitalcertificateisadatafileandisissuedbyatrustedthirdpartycalledCA.Thereareanumberoftypesofdigitalcertificates,eachwithitsownleveloftrustworthinessandareaofapplication.(译文)Ingeneral,adigitalcertificateincludes:,5/26/2020,19,TextAnalysis,thenameoftheholderandotheridentificationinformation.theholderspublickeywhichcanbeusedtoencryptmessage.thenameoftheCAthatissuedthedigitalcertificate.thevalidityperiodofthedigitalcertificate.,5/26/2020,20,TextAnalysis,Non-repudiationForbusinesstransactions,unilateralrepudiationofatransactionbyeitherpartyisunacceptableandmayresultinlegalaction.(译文)Companiesengagedinelectroniccommerceareoftenvulnerabletonon-repudiationrisks.Aneffectivewaytoenablenon-repudiationisdigitalsignature.Adigitalsignatureisactuallyadigestofmessagethatisencryptedandthensentalongwiththemessage.Whenyouuseaprivatekeytoencryptadigestofmessage,youcreateadigitalsignature.Thenyouhavenowaytodenyyoueversentaparticularmessage.,5/26/2020,21,TextAnalysis,TheInternetbringspeopleincredibleconvenienceandopportunities,butatthesametimeitbringsrisksaswell.TheheavylessonsofInternetcrimedrawpeoplesgreatattentiontoimprovethesituationofelectroniccommercesecurity.(译文),5/26/2020,22,Exercises,Readingcomprehension:1MarkthefollowingsentenceswithT(true)orF(false)accordingtothetext.(1)Asymmetricalencryptionmeansthatthesenderencryptsthemessagewiththeprivatekeyandthereceiverdecryptthemessagewiththepublickey.F(2)TheonlywaytoensuremessageintegrityiscomparingthereceivedandcalculatedHashvalues.F,5/26/2020,23,Exercises,(3)AdigitalcertificateisadatafileandisissuedbyatrustedthirdpartycalledCA(CertificateAuthority).T(4)Companiesengagedinelectroniccommercemayfacenon-repudiationrisks.T(5)TheheavylessonsofInternetcrimehaveimprovedthesituationofelectroniccommercesecurity.F,5/26/2020,24,Exercises,2.Answerthefollowingquestionsaccordingtothetext.(1)Whatdothebasicrequirementsforelectroniccommercesecurityincludeingeneral?Ingeneral,thebasicrequirementsforelectroniccommercesecurityincludeprivacy,integrity,authenticityandnon-repudiation.,5/26/2020,25,Exercises,(2)Whatsthemajordifferencebetweensymmetricalandasymmetricalencryption?Symmetricalencryptionmeansthatthesamekeywasusedtobothencryptanddecryptamessage,andasymmetricalencryptionutilizesapairofkeyspublickeyandprivatekey.,5/26/2020,26,Exercises,(3)Whatdoesmessageintegritymean?Messageintegritymeansamessagehasnotbeenalteredinanyway,eitherintentionallyorunintentionally.,5/26/2020,27,Exercises,(4)Whatdoesadigitalcertificateincludeingeneral?Ingeneral,adigitalcertificateincludes:thenameoftheholderandotheridentificationinformation,theholderspublickeywhichcanbeusedtoencryptmessage,thenameoftheCAthatissuedthedigitalcertificate,thevalidityperiodofthedigitalcertificate.,5/26/2020,28,Exercises,(5)Whatsadigitalsignature?Adigitalsignatureisactuallyadigestofmessagethatisencryptedandthensentalongwiththemessage.,5/26/2020,29,Exercises,Vocabulary:Matcheachofthefollowingwordstothephraseordefinitionthatismostcloselyrelated.,A5B6C7D1E4F2G3,5/26/2020,30,Exercises,Translation:1.TranslatethefollowingsentencesintoChinese.(1)Thedifficultyishowtohavethesenderandthereceiverwhowillprobablynevermeetagreeonakeythatcannotbeknownbyanyoneelse.信息的发送者和接受者很可能一直不会见面，这样他们约定密钥而不让第三方知道就有困难。,5/26/2020,31,Exercises,(2)Amessagethathasnotbeenalteredinanyway,eitherintentionallyorunintentionally,issaidtohavemaintaineditsintegrity.如果信息没有被有意或无意地以任何方式篡改，我们就说信息保持了完整性。,5/26/2020,32,Exercises,(3)Whenanelectronicmessageisreceived,theidentityofthesenderneedstobeverifiedinordertodeterminewhetherthesenderiswhoheclaimstobe.当收到电子信息时，需要对发送者的身份进行核实以保证发送者就是他所声称的人。,5/26/2020,33,Exercises,(4)Forbusinesstransactions,unilateralrepudiationofatransactionbyeitherpartyisunacceptableandmayresultinlegalaction.在商务活动中，任何一方否认交易都是不可接受的，可能会导致法律纠纷。,5/26/2020,34,Exercises,2.TranslatethefollowingphrasesintoEnglish.(1)一对密钥，即公钥和私钥apairofkeyspublickeyandprivatekey(2)发送加密信息sendanencryptedmessage(3)事先约定密钥agreeonthekeysinadvance(4)保证信息完整性ensuremessageintegrity(5)与发出的信息一致thesameasthesentmessage,5/26/2020,35,Exercises,(6)颁发数字证书的CA机构的名称thenameoftheCAthatissuedthedigitalcertificate(7)数字证书的有效期thevalidityperiodofthedigitalcertificate(8)用私钥对信息摘要进行加密useaprivatekeytoencryptadigestofmessage(9)互联网犯罪的沉痛教训heavylessonsofInternetcrime(10)提升电子商务安全状况improvethesituationofelectroniccommercesecurity,5/26/2020,36,Exercises,Speaking:1Readthetextloudly,andtrytorecitethefollowingparagraphs.Ingeneral,thebasicrequirementsforelectroniccommercesecurityincludeprivacy,integrity,authenticityandnon-repudiation.TheInternetbringspeopleincredibleconvenienceandopportunities,butatthesametimeitbringsrisksaswell.TheheavylessonsofInternetcrimedrawpeoplesgreatattentiontoimprovethesituationofelectroniccommercesecurity.,5/26/2020,37,Exercises,2.Readandpracticethefollowingdialoginpairs.A:Hi,Jerry,Ijustreadanarticleaboutelectroniccommercesecurity.MayIaskyousomequestions?B:Sure,goahead.A:Whatarethebasicrequirementsforelectroniccommercesecurity?B:Ithinktheyareprivacy,integrity,authenticityandnon-repudiation.,5/26/2020,38,Exercises,A:OK,whydopeoplepaygreatattentiontothismatter?B:Youknow,theInternetbringsusincredibleconvenienceandopportunities,butatthesametimeitbringsusrisksaswell.Somepeoplereallysufferedheavylosses.Sopeopleareeagertoimprovethesituationofelectroniccommercesecurity.A:Well,thanksforyourinformation.,5/26/2020,39,Exercises,PracticalWriting:TheInternetisnowindispensablefordailylifeandcommunications,andInternetsecurityisbecomingahotpotato.ManypeoplehaveexperiencedInternetsecurityproblemsandsufferedfinanciallosses.Trytowriteanessayaboutthecurrentsecuritysituationine-commerce.Thefollowingquestionsareforyourreference.,5/26/2020,40,Exercises,IsInternetsecurityahottopictous?Doyouhaveexperiencesinbeingattackedbyvirus?Howdoyoutakemeasurestoprotectyourfilesinthecomputer?Doyouthinkourcurrentsecuritysituationissafeine-commerce?Andhowcanweimproveitinthefuture,inyouropinion?,5/26/2020,41,Exercises,ReadingMaterial1.B2.C3.A4.D5.C,5/26/2020,42,Thedifficultyishowtohavethesenderandthereceiverwhowillprobablynevermeetagreeonakeythatcannotbeknownbyanyoneelse.信息的发送者和接受者很可能一直不会见面，这样他们约定密钥而不让第三方知道就有困难。,5/26/2020,43,Thepublickeyisavailabletoanyonewhowantstosendanencryptedmessagetotheholderoftheprivatekey.公钥是公开的，想要给私钥拥有者发送信息的人都可以用对应的公钥加密。,5/26/2