fuq阅读答案实用word文档 16页.docx
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fuq阅读答案实用word文档 16页.docx
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fuq阅读答案
篇一:
密码学答案
《密码学原理与实践(第三版)》课后习题参考答案
(由华中科技大学信安09级提供)
第一章
1.1(李怡)
(a)51(b)30(c)81(d)7422
1.2(贾同彬)
证明:
令t1=(-a)modm,t2=m-(amodm),则t1≡t2(modm).
又0 1.3(张天翼)证明充分性: 若a? b(modm),则可得a? b? km,设b? jm? r,0? r? m,j? N,则有 a? (k? j)m? r,故有amodm? r,由假设得bmodm? r,故amodm? bmodm 证明必要性: 若amodm? bmodm,则可设amodm? bmodm? r,则有a? km? r,b? jm? r,其中j,k? N,因此a? b? (k? j)m,即ma? b,故a? b(modm)综上,问题得证 1.4(李怡) 令a? km? r,0? r? m,则r? amodm ? a? 而r? a? km,所以只需证明k? ? ? . m? ? a? raa? a? 因为k? ? m? -r? 0,所以? 1? k? 即k? ? ? mmm? m? 1.5(李志远) 穷举密钥法来破解移位密码即将这个字符串每个字母移位1,2,3…26次,然后判断这26个字符串哪个符合英语规则。 故我编写如下的C++来实现如此功能#include if(word=='Z')return'A';elsereturnword+1;} intmain() { cout<<"pleaseinputthestring"< for(n=1;n<=26;n++){ intnum; for(num=0;num<43;num++){ string1[num]=change(string1[num]);} cout< 解释: 1.代码专为本题编写,故输入字符数不能多于43个,且输入范围仅限大写英语字母2.将题中的42个字母BEEAKFYDJXUQYHYJIQRYHTYJIQFBQFBQDUYJIIKFUHC输入并回车3.得到的结果 CFFBLGZEKYVRZIZKJRSZIUZKJRGCREVZKJJLGVIDREforturn1 DGGCMHAFLZWSAJALKSTAJVALKSHDSFWALKKMHWJESFforturn2 EHHDNIBGMAXTBKBMLTUBKWBMLTIETGXBMLLNIXKFTGforturn3 FIIEOJCHNBYUCLCNMUVCLXCNMUJFUHYCNMMOJYLGUHforturn4 GJJFPKDIOCZVDMDONVWDMYDONVKGVIZDONNPKZMHVIforturn5 HKKGQLEJPDAWENEPOWXENZEPOWLHWJAEPOOQLANIWJforturn6 ILLHRMFKQEBXFOFQPXYFOAFQPXMIXKBFQPPRMBOJXKforturn7 JMMISNGLRFCYGPGRQYZGPBGRQYNJYLCGRQQSNCPKYLforturn8 KNNJTOHMSGDZHQHSRZAHQCHSRZOKZMDHSRRTODQLZMforturn9 LOOKUPINTHEAIRITSABIRDITSAPLANEITSSUPERMANforturn10 MPPLVQJOUIFBJSJUTBCJSEJUTBQMBOFJUTTVQFSNBOforturn11 NQQMWRKPVJGCKTKVUCDKTFKVUCRNCPGKVUUWRGTOCPforturn12 ORRNXSLQWKHDLULWVDELUGLWVDSODQHLWVVXSHUPDQforturn13 PSSOYTMRXLIEMVMXWEFMVHMXWETPERIMXWWYTIVQERforturn14 QTTPZUNSYMJFNWNYXFGNWINYXFUQFSJNYXXZUJWRFSforturn15 RUUQAVOTZNKGOXOZYGHOXJOZYGVRGTKOZYYAVKXSGTforturn16 SVVRBWPUAOLHPYPAZHIPYKPAZHWSHULPAZZBWLYTHUforturn17 TWWSCXQVBPMIQZQBAIJQZLQBAIXTIVMQBAACXMZUIVforturn18 UXXTDYRWCQNJRARCBJKRAMRCBJYUJWNRCBBDYNAVJWforturn19 VYYUEZSXDROKSBSDCKLSBNSDCKZVKXOSDCCEZOBWKXforturn20 WZZVFATYESPLTCTEDLMTCOTEDLAWLYPTEDDFAPCXLYforturn21 XAAWGBUZFTQMUDUFEMNUDPUFEMBXMZQUFEEGBQDYMZforturn22 YBBXHCVAGURNVEVGFNOVEQVGFNCYNARVGFFHCREZNAforturn23 ZCCYIDWBHVSOWFWHGOPWFRWHGODZOBSWHGGIDSFAOBforturn24 ADDZJEXCIWTPXGXIHPQXGSXIHPEAPCTXIHHJETGBPCforturn25 BEEAKFYDJXUQYHYJIQRYHTYJIQFBQDUYJIIKFUHCQDforturn26 经过英语分析,发现当移位密码密钥为17时,字符串有英文含义LOOKUPINTHEAIRITSABIRDITSAPLANEITSSUPERMAN(看天上,是一只鸟,是一架飞机,是一位超人)故移位密码密钥为17 1.6(司仲峰)对合密钥为0和13 1.7(陈诗洋) (a)m=30=2*3*5 φ(30)=30*(1-1/2)*(1-1/3)*(1-1/5)=8故密钥量是8*30=240 (b)m=100=22*52 φ(100)=100*(1-1/2)*(1-1/5)=40故密钥量是40*100=4000 (c)m=1225=52*72 φ(1225)=1225*(1-1/5)*(1-1/7)=840故密钥量是840*1225=1029000 1.8(周玉坤)解: 在 中若元素有逆,则必有gcd(a,m)=1; =1,利用广义欧几里得除法,找到整数s和 、 的解法都相 若元素a存在逆使得 a t,使得: sa+tm=1 ,则=s(modm)是a的逆。 似,直接给出结果。 (1) 、 gcd(a,28)=1,则a=1,3,5,9,11,13,15,17,19,23,25,27. (2) 、 =1 ,=15 , =19, =5, =17 , =3 , =25 , =11 , =23 , =9 , =27 gcd(a,33)=1,则a=1,2,4,5,7,8,10,13,14,16,17,19,20,23,25,26, 28,29,31,32 (3) 、 =1 ,=10 ,=7 ,=13 , =17 , =25 , =20, =19 ,=31 ,=4 ,=32 =29 =2, =14, =28 ,=5 ,=8 , =26 ,=23,=16 , gcd(a,35)=1,则a=1,2,3,4,6,8,9,11,12,13,16,17,18,19,22,23,24,26,27,29,31,32,33,34 =1 ,=16 , =18, =3, =12 , =9 , =6 ,=11 , =22,=33 , =4, =2 =27 , 1.9(薛东) =24 ,=29 , =8,=26 , =32 ,=23, =19 ,=17 , =31 ,=34 =13 设1≤a≤28,利用反复试验的方法求出a-1mod29的值。 解: 由乘法逆存在条件gcd(a,29)=1知a=1,2,3,…,28均存在逆元。 计算可得: 1-1=12-1=153-1=104-1=225-1=66-1=57-1=258-1=119-1=1310-1=311-1=812-1=1713-1=914-1=2715-1=216-1=2017-1=1218-1=2119-1=2620-1=1621-1=1822-1=423-1=2424-1=2325-1=726-1=1927-1=1428-1=28 1.10 (a)dK(y)=6y+19(mod29)(b)略 1.11(程玲) (a)证明: 加密函数为e(x)=(ax+b)modn,即可令ax+b≡y(modn),等价ax≡y-b(modn),即x≡aˉ1(y-b)(modn),即x≡(aˉ1y-aˉ1b)(modn)要使k为对合密钥,则a≡aˉ1(modn),b≡-aˉ1b(modn) 即aˉ1modn≡a且b(1+aˉ1)≡0(modn),也就是b(1+a)≡0(modn)反过来,当aˉ1modn≡a且b(1+a)≡0(modn)可得 b(1+aˉ1)≡0(modn),即b≡-aˉ1b(modn),K为对合密钥 (b)解: 假设对合密钥为K=(a,b) a要满足gcd(a,15)=1,可得a=1,2,4,7,8,11,13,14又因为a要满足aˉ1mod15≡a,则a=1,4,11,14 b需满足b(1+a)≡0(mod15) 当a=1,即2b≡0(mod15),可得b≡0(mod15) 当a=4,即5b≡0(mod15),可得b=0,3,6,9,12当a=11,即12b≡0(mod15),可得b=0,5,10当a=14,即15b≡0(mod15),可得b={x|x? Z15} 篇二: 石头城阅读练习及答案 石头城 刘禹锡 山围故国周遭在,潮打空城寂寞回。 淮水东边旧时月,夜深还过女墙来。 (1)有人说后两句有两个字用的最好,请简要分析。 (3分) 参考答案: 旧、还。 (1分);旧有原来的之意,用旧来形容月(月本无新旧之分),便很自然地让人联想到过去繁华岁月,旧时月是它的见证。 然而繁华易逝,而今月下则祗剩一片凄凉。 (1分)末句的还字,意味着月虽还来,然而许多东西已一去不返了。 (1分) (2)结合具体诗句,赏析本诗的艺术手法与思想感情: 参考答案: 情景交融。 (1分)这首诗咏怀石头城,表面看句句写景,实际上句句抒情。 (1分)诗人写了山、水、明月和城墙等荒凉景色,写景之中,深寓著诗人对六朝兴亡和人事变迁的慨叹,悲凉之气笼罩全诗,读之怆然。 (2分) 篇三: 高二英语测试题 高二英语测试题 第一节单项填空(共15小题;每小题1分,满分15分) 从A,B,C,D四个选中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑 21.PreparationsarebeingmadefortheOlympicGames________inBeijingin201X.A.HeldB.holdingC.tobeheldD.tohold 22.Whenyougooutingwithyoursisters,youmustseeto________thattheyaresafe.A.everythingB.itC.themD.yourself23.—Tomisverystupid.Hefailsineveryexam.—Inmyopinion,heis________thanstupid. A.lazierB.nolazierC.morelazyD.lazierrather 24.—I’lltalktomysonBillaboutitassoonaspossible.Heusuallylistens.—Weneed________listening.Weneedaction. A.morethanB.lessthanC.notmorethanD.nomorethan 25.It'squiteobviousthattheagingpopulationinChinawillcause________heavypressureon________wholesocietyinthefuture A.a;aB.the;/ C.a;theD./;the 26.HelpwillcomefromtheUN,buttheaidwillbe________nearwhatisneeded.A.everywhereB.somewhereC.anywhereD.nowhere 27.Themailwas________fortwodaysbecauseofthesnowstorm.A.heldoutB.heldoffC.heldupD.helddown28.Whyis________youaresolatefortheclass? A.itthatB.thatit C.itD.that 29.ScientistsbelievenativeAmericansarrivedbycrossingthelandbridgethatconnectedSiberia(西伯利亚)and________morethan10,000yearsago.A.thisisAlaskaB.Alaskaisnow C.isnowAlaskaD.whatisnowAlaska 30.JackisoneofthosemenwhoIamsurealwaysdo________besteveninthemostdifficultsituations. A.hisB.yourC.theirD.one’s 31.—I’msorry,Ishouldn’thavebeensorudetoyou.—You________yourtemperbutthat’sOK. A.havelostB.hadlostC.didloseD.werelosing 32.Toeverybody’ssurprise,thefashionableyounglady________tobeathief. A.foundoutB.provedout C.putoutD.turnedout 33.Thisphotoofminewastaken________stoodthefamoushightower. A.whichB.inwhichC.whereD.there 34.Ifyoukeeppracticingyoursoninfootball,he________tobeafamousplayer.A.wantsB.hopes C.wishesD.promises 35.You________havetoldhimthebadnews,whichmadethingsevenworse.A.shouldn’tB.needn’t C.couldn’tD.wouldn’t 第二节完形填空(共20小题;每小题1.5分,满分30分) 阅读下面短文,掌握其大意,然后从36-55各题所给的四个选项(A,B,C和D)中,选出最佳选项。 Itisgenerallyacceptedthattheexperiencesofthechildinhisfirstyearslargelydeterminehischaracterandlaterpersonality.Everyexperience36thechildsomethingandtheeffectsare.“Upbringing”normallyusedtorefertothetreatmentandtrainingofthechild38thehome.Thisisclosely39thetreatmentandtrainingofthechildinschool,whichisusuallydistinguished(区别)bytheeducation”.Inasocietysuchasours,both41andteachersareresponsibleforthechancesprovidedforthedevelopmentofthechild,42upbringingandeducationdependoneachother. Theidealsandpracticesofchildupbringingaredifferentfromculturetoculture.43themorerural(农村的)thegroup,themorethecustomsofchildupbringing.Inmoretechnologicallydevelopedsocieties,childhoodandadolescence(青春期)arelikelylongtime,Earlyupbringinginthe48isnaturallyaffectedbothbytheculturalpatternofthegroupandbytheparents'49andtheiraimsanddependsnotonlyonupbringingandeducationbutalsoontheabilitiesofthechild.Widedifferencesofintelligence(智力)andcharacter51eveninchildrenofthesamefamily. Parentscan52whatisnormalinphysical,mentalandsocialdevelopment,by53someofthemanybooks54onscientificknowledgeintheseareas,or,lessdependablesincethesample(实例)issmaller,bycomparing55withfriendsandrelativeswhohavechildren.36.A.offers37.A.dangerous38.A.from B.affordsB.limitedB.for C.teachesC.immediateC.outofC.madefromC.kindC.studentsC.inthatcaseC.GenerallyC.unusualC.tospendC.hopingfor D.paysD.increasingD.withinD.relatedtoD.age D.classmatesD.evenifD.HoweverD.curiousD.tospreadD.waitingfor 39.A.coveredwithB.devotedto40.A.termB.time41.A.childrenB.parents42.A.sothatB.solongas43.A.surprisinglyB.Besides44.A.strange45.A.tocover46.A.resultingin B.unchangableB.tochangeB.beginningwith 47.A.body 48.A.school49.A.care 50.A.wonderful51.A.happen B.brainB.homeB.luckB.greatB.makeB.findoutB.lookingintoB.decidedB.letters C.characterC.societyC.abilityC.namedC.existC.workoutC.holdingoutC.basedC.notes D.educationD.worldD.jobD.bornD.holdD.makeupD.takingupD.carriedD.answers 52.A.bringdown53.A.referringto54.A.called55.A.books 第三部分: 阅读理解(共20小题;每小题2分,满分40分) 阅读下列短文,从每题所给的四个选项(A,B,C和D)中,选出最佳选项。 A ByLOSANGELESTIMESPublishedon201X-02-10 Postedon201X-01-1810︰59︰54 Nervousuncertaintysurroundsthefate(命运)ofUSjournalistDanielPearl,withnoclearcommunicationfromhiskidnappers(绑匪)andnosignofhiswhereaboutsafterthreeseparatepolicesearchesforhisbodyinthetroublesomepertcityKarachi,Pakistan. Pearl,a38-year-oldWallStreetJournalreporter,
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