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
85
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.
According to paragraph 2 , the keys are changed frequently in order to______.
选项
A、encode more data
B、decode more data
C、give people more private keys
D、make information difficult to decode
答案
D
解析
文章指出,密钥定期改良,进一步阻止了未经允许的访问,并使加密信息难于解密。第二段Thekeys are modified periodically further hampering unauthorized access and makingthe encrypted infor-mation difficult to decode or forge.
转载请注明原文地址:https://kaotiyun.com/show/WsBO777K
0
考博英语
相关试题推荐
Thebiggestproblemwiththecomputeristhat
Lookatthenotesonhowtosucceedinajobinterview.Someinformationismissing.Youwillhearpartofapresentationbythe
Lookatthenotesbelow.Someinformationismissing.YouwillhearaninterviewbetweenAnnaMarsh,whoworksforabusinessma
Lookatthepassagebelow.Someinformationismissing.Youwillhearawomantalkingaboutpersonalexperience.Foreachquesti
Anotherpersonarguesthatpricesshouldbeincreasedbecauseof______.
HowmuchmoneywouldthecompanyprobablypayfortheSalesManager?
Lookatthenotesbelow.Someinformationismissing.YouwillhearareportonE-money.Foreachquestion(16-22),fillinthem
•Readthefollowingpassageaboutsuccessfulbusinessexecutives.•Arethesentences16-22"Right"or"Wrong"?Ifthereisn’t
•Readthefollowingpassagebelowaboutasuccessfulsteelexecutive.•Foreachquestion(23-28),choosethecorrectanswer.•
Wemustsafeguardagainstcoercedconfessions.
随机试题
理智型就餐心理不易受环境的影响和情感的支配。()
()抽油机井原油含水样是在井口用取样桶通过取样阀放喷溢流而录取的新鲜液流。
在商业企业以投资为目的评估商品存货时,以下说法正确的有
下列关于结合胆红素的叙述,正确的是
下列各项中,属于阳虚证的临床表现是
A、硫酸铁铵B、结晶紫C、淀粉D、二甲酚橙E、酚酞;下列测定中所选择的指示剂为用HClO4滴定液测定盐酸麻黄碱
下列有关银行账户的表述中,正确的有()。
“进口口岸”栏应填报()。“包装种类”栏应填报()。
市人民政府:近年来,在市委、市政府正确领导下,我乡的经济和社会各项事业快速发展,并取得了显著成效。今年,我乡将按照市委、市政府的统一(),认真开展各项工作,确保圆满完成各项工作任务,在当前的工作中,我乡有以下几方面的工作还需市政府在资金等方面予以
1935年6月,红一、红四方面军会合后,中共中央在()召开政治局会议,决定北上创建川陕甘根据地。
最新回复
(
0
)