首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
To fight against computer crimes, a computer system needs a sure way of identifying its right users and rejecting those who are
To fight against computer crimes, a computer system needs a sure way of identifying its right users and rejecting those who are
admin
2010-05-09
44
问题
To fight against computer crimes, a computer system needs a sure way of identifying its right users and rejecting those who are not entitled to use it. The identification system should be quick, simple, and convenient.
At present, signatures are widely used to identify credit card holders, but it takes an expert to detect a good forgery. Sometimes even a human expert is fooled, and there is no reason to believe that a computer could do any better.
Photographs are also sometimes used for identification. But, people find it inconvenient to stop by a credit-card company and to be photographed. Companies might lose business if they made the pictures under absolute requirement. Also, photographs are less useful these days, when people frequently change their appearance by changing the way they wear their hair. Finally, computer programs for analyzing photographs are still highly experimental.
Cash-drawing systems often use two identification numbers: One is recorded on a magnetic stripe on the identification cards, and the other is given to the CRS holder. When the user inserts his card into the cash-drawing terminal, he keys in the identification number he has been given. The computer checks to see that the number recorded on the card and the other keyed in by the user refer to the same person.
For a long time, fingerprints have provided a method of positive identification. But they suffer from two problems. One is that there is no simple system for comparing fingerprints electronically, the other is that because most people associate being fingerprinted with being arrested; they almost surely would resist being fingerprinted for routine identification.
Voiceprints have been suggested. With these, the user has only to speak a few words for the computer to analyze his voice. There are no psychological problems here. And technically it’s easier to take and analyze voiceprints than fingerprints. However, it has yet to be proved that the computer cannot be fooled by imitation. Also, the voice is subjected to the noise and distortion of a telephone line.
Even lipprints have been suggested. But it’s doubtful that kissing computers will ever catch on.
The passage is organized by _______.
选项
A、a simple listing of facts
B、presenting a solution and discussing its advantages or disavantages
C、cause and effect
D、comparison and contrast
答案
B
解析
主旨题 文章首先就提出计算机识别系统的基本原则,然后逐一例举可采用的方法及其利与弊,可知B项符合文章的谋篇模式。
转载请注明原文地址:https://kaotiyun.com/show/YSOK777K
0
大学英语六级
相关试题推荐
Accordingtothispassage,adiethighinplant-basedfoodsplaysanimportantroleinfightingallkindsofdiseases.Fruits,
A、Symbolsofhappiness.B、Symbolsofgreatness.C、Examplesofcourageanddetermination.D、Examplesofglory.CWhatdothestar
A、Theyusuallyacceptresponsibility.B、Theyblamefactorsbeyondtheircontrol.C、Theycomplainabouttheirpersonalproblems.
A、Heisseriouslyillandstillinhospital.B、MarywilldohisworkinsteadC、Morrisonishisdoctor.D、Hewillgotoworktomo
MildweatherhasbroughtJapan’smuch-lovedcherrytreesinto(36)______twoweeksearlythisyear,butnoteveryoneis(37)____
Thepurposeofthelargecompaniesinrecruitingoutsidersandputtingthemontheboardofdirectorsisto______.Whichofth
A、Theneedtoexercisethememory.B、Howthebraindiffersfromotherbodytissues.C、Theunconsciouslearningofaphysicalact
A、Winning.B、Findinggold.C、Justtofinish.D、Beingabletoparticipate.CWhichisconsideredavictoryformostofthedrivers
Spendingtimeinabookshop______.Accordingtotheauthor,filebestwaytoescapetherealitiesofeverydaylifeis______.
A、EveryoneenjoyedhimselfatJohn’sparties.B、Thewomandidn’tenjoyJohn’spartiesatall.C、Itwillbethefirsttimeforth
随机试题
下列关于常见的塑料容器,说法错误的是()。
若=k(k>0),则正项级数的敛散性为_________
重度营养不良体重低于正常平均值
关于氯己定溶液,描述正确的是()
用稀醇或醇提取苷,以乙酸乙酯、氯仿等提取苷元用水提取,提取液加酸调pH1~2,得到沉淀为所需黄酮
A.普萘洛尔B.苯妥英钠C.奎尼丁D.利多卡因E.胺碘酮长期服用可引起甲状腺功能紊乱的药物是
下列各项中,能够作为公允价值套期的被套期项目有()。
王明户籍地在成都市青羊区,因工作需要,其在成都市锦江区购有一房。后因道路扩建,致使王明的房屋内的木地板大量损坏。对此,王明需向()提起行政诉讼。
科举考试分为文科、武科的朝代是
Accordingtotheauthor,distinctionsbetweenthoseengagedinthecreativeartsandinnaturalsciencescaninpartbeexplaine
最新回复
(
0
)