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
A variety of simple techniques can prevent computer crime. For example, destroying printed information, protecting computer scre
A variety of simple techniques can prevent computer crime. For example, destroying printed information, protecting computer scre
admin
2010-12-25
46
问题
A variety of simple techniques can prevent computer crime. For example, destroying printed information, protecting computer screens from observation. Keeping printed information and computers in locked cabinets, and clearing desktops of sensitive documents prevent access to confidential information. But more sophisticated methods are also necessary to prevent computer crimes.
One technique to protect confidentiality is encryption. Information can be scrambled and unscrambled u-sing mathematical equations and a secret code called a key. Two keys ale usually employed, one to encode and the other to decode the information. The key that encodes the data, called the private key, is possessed by only the sender. The key that decodes the data, called the public key, may be possessed by several receivers. The keys are modified periodically, further hampering unauthorized access and making the encrypted information difficult to decode or forge.
Another technique to prevent computer crime is to limit access of computer data files to approved users. Access control software verifies computer users and limits their privileges to view and alter files. Records can be made of the files accessed, thereby making users accountable for their actions. Military organizations give access rights to classified, confidential, secret, or top-secret information according to the corresponding security clearance level of the user. Passwords are confidential sequences of characters that give approved users access to computers. To be effective, passwords must be difficult to guess. Effective passwords contain a mixture of characters and symbols that are not real words.
Tokens are tamper-resistant plastic cards with microprocessor chips that contain a stored password that automatically and frequently changes. When a computer is accessed using a token, the computer reads the token’s password, as well as another password entered by the user, and matches these two to an identical list In the future, passwords and tokens may be reinforced by biometrics, identification methods that use u-nique personal characteristics, such as fingerprints, retinal patterns, skin oils, deoxyribonucleic acid (DNA), voice variations, and keyboard-typingrhythms.
Computer networks, multiple computers linked together, are particularly vulnerable to computer crimes. Information on networks can be protected by a firewall, a computer placed between the networked computers and the network. The firewall prevents unauthorized users from gaining access to the computers on a network, and it ensures that information received from an outside source does not contain computer viruses, self-replicating computer programs that interfere with a computer’s functions.
"Vulnerable"in the last paragraph is closest in meaning to______.
选项
A、valuable
B、changeable
C、susceptible
D、dependable
答案
C
解析
文章指出,计算机网络很容易受到计算机犯罪的攻击。最后一段Computer networks,multiplecomputers linked together,are particularly vulnerable to computer crimes.
转载请注明原文地址:https://kaotiyun.com/show/HsBO777K
0
考博英语
相关试题推荐
Whatisthepercentageoftheincreaseinthenewordersthathasbeenagreedupon?
Thebiggestproblemwiththecomputeristhat
Lookatthenotesaboutanenterprise.Someinformationismissing.YouwillhearpartofapresentationbytheInternationalMa
Lookatthenotesaboutthequalitiesofgreatmanagers.Someinformationismissing.Youwillhearpartofapresentationbya
Lookatthenotesaboutthequalitiesofgreatmanagers.Someinformationismissing.Youwillhearpartofapresentationbya
Whatdoesthespeakerthinkthecompanyshoulddo?
Thecustomercan’thavearefundbecause
•Readthefollowingpassageaboutsuccessfulbusinessexecutives.•Arethesentences16-22"Right"or"Wrong"?Ifthereisn’t
EXPRESS-PRINThasopenedanewofficeinthisarea.Pleasecallintodiscussyourphotocopyingrequirements.
不只全市的国民生产总值增长厂7.8%,信息产业也实现了跨越式的发展。
随机试题
鲁迅的第一篇白话小说是( )
A.固本益肠丸B.四神丸C.参苓白术散D.加味保和丸E.香连丸治疗湿热内蕴之泄泻,宜选用的中成药是()。
外籍个人威廉姆斯先生(在中国境内无住所)受美国其任职的某机构委托来华工作,2019年6月10日来华,8月2日回美国处理公务,8月10日返回中国,8月31日完成在华工作,回到美国。在华工作期间,中国企业每月向威廉姆斯先生支付工资60000元,同时其所在外国机
在人群心理学中,人们把替罪羊引起的心理效应现象,称之为替罪羊效应。替罪羊原指古代犹太教在赎罪口用做祭品的羊,表示由它替人受罪,后比喻代人受过的人。根据上述定义,下列属于替罪羊效应的是()。
ERG理论是阿尔德福尔于1969年提出的一种与马斯洛需求层次理论密切相关但又有些不同的理论。他把人的需要分为三类,包括()
为什么说教育对人的发展起主导作用?
课外、校外教育的主要特点是()
提前解除收容教育的,实际执行的收容教育期限不得少于原决定期限的三分之二。()
一本书有100多页,小王每天看固定的页数,看了18天后,发现未看的页数正好是已看页数的,又看了7天后发现未看的页数正好比已看的页数少100页。问这本书共有多少页?()
Interrelationshipfragmentedmacrocosmbewilderedmicrocosmfacilitatedependencyrecognizedi
最新回复
(
0
)