缩写作文一共300词左右,麻烦达人帮我缩写到200词左右,Electronicmoney(digitalcash)Makingfilesuniquewithdigitalsignaturesisthebasisofdigitalcash(electronicmoney).Alicethebankercreateselectronicbanknotesofvarious|小学作文问答-字典翻译问答网

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缩写作文一共300词左右,麻烦达人帮我缩写到200词左右,Electronicmoney(digitalcash)Makingfilesuniquewithdigitalsignaturesisthebasisofdigitalcash(electronicmoney).Alicethebankercreateselectronicbanknotesofvarious

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缩写作文

一共300词左右,麻烦达人帮我缩写到200词左右,

Electronicmoney(digitalcash)

Makingfilesuniquewithdigitalsignaturesisthebasisofdigitalcash(electronicmoney).Alicethebankercreateselectronicbanknotesofvariousdenominationsandputsauniquenumberoneverybanknote.Shesignstheresult.BobtheclientnowmakesawithdrawalfromhisaccountwithAliceandreceivessomeofthesignedbanknotes.ThebanknotescanbeanonymousorincludeBob'sname.BobthengoestoCharlie'selectronichardwarestoreandpurchasesadigitalcamerausingthesebanknotesaspayment.CharlieverifiesthatthebanknotesbearAlice'ssignatureandsoknowsthattheyarenotcounterfeit.

Bobcouldofcoursemakeasmanycopiesofthesignedbanknotesashewants,sincethebanknotesareinelectronicform.CharliethereforenowhastogotoAliceandreporttohertheuniquenumberonthebanknotehereceived.Alicewillthenrecordthatnumberas"spent"andindicatetoCharliethatthetransactionisokay.Ifthenumberwasalreadyrecordedas"spent",Alicewillrejectthetransaction.Ifthetransactionisokay,theamountindicatedonthebanknotesiscreditedtoCharlie'saccount.

Thissystemhasmanyadvantagesovertraditionalpaymenttechniques.Alicecancreatebanknotesofanydenomination,includingforexamplemillicents(0.001cents).ThiswayforexampleanelectronicarchivecouldchargeonemillicentforeverydocumentBobrequests,andBobcouldpaythatwithouthavingtotakeasubscriptionormakeadepositinadvance.

OnedisadvantageofthissystemisthatitrequiresCharlietoimmediatelycheckwithAlicewhetherthebanknotehestillvalid.IfCharliewaitsevenafewminutes,BobcanspendthebanknoteagainatDave's.TheneitherCharlieorDaveisnotgoingtogethismoney.

Thisprincipleiscurrentlyusedforelectroniccoupons.Asacouponislessvaluablethanabanknote,theriskofdoublespendingacouponappearstobeacceptable.Furthermore,couponsareusuallyonlyvalidatoneparticularstore.

邵成勋回答：

　　Electronicmoney(digitalcash) 　　Makingfilesuniquewithdigitalsignaturesisthebasisofdigitalcash(electronicmoney).Alicethebankercreateselectronicbanknotesofvariousdenominationsandputsauniquenumberoneverybanknote.Shesignstheresult.BobtheclientnowmakesawithdrawalfromhisaccountwithAliceandreceivessomeofthesignedbanknotes.ThebanknotescanbeanonymousorincludeBob'sname.BobthengoestoCharlie'selectronichardwarestoreandpurchasesadigitalcamerausingthesebanknotesaspayment.CharlieverifiesthatthebanknotesbearAlice'ssignatureandsoknowsthattheyarenotcounterfeit. 　　Bobcouldofcoursemakeasmanycopiesofthesignedbanknotesashewants,sincethebanknotesareinelectronicform.CharliethereforenowhastogotoAliceandreporttohertheuniquenumberonthebanknotehereceived.Alicewillthenrecordthatnumberas"spent"andindicatetoCharliethatthetransactionisokay.Ifthenumberwasalreadyrecordedas"spent",Alicewillrejectthetransaction.Ifthetransactionisokay,theamountindicatedonthebanknotesiscreditedtoCharlie'saccount. 　　Thissystemhasmanyadvantagesovertraditionalpaymenttechniques.Alicecancreatebanknotesofanydenomination,includingforexamplemillicents(0.001cents).ThiswayforexampleanelectronicarchivecouldchargeonemillicentforeverydocumentBobrequests,andBobcouldpaythatwithouthavingtotakeasubscriptionormakeadepositinadvance. 　　OnedisadvantageofthissystemisthatitBobcanspendthebanknoteagainatDave's.