[分享]英语精典短文每日一练

The target of a crime involving computers may be any piece of the computing system．A computing system is a collection of hardware，software，storage media，data，and persons that an organization uses to do computing tasks．Whereas the obvious target of a bank robbery is cash，a list of names and addresses of depositors might be valuable to a competing bank．The list might be on paper，recorded on a magnetic medium，stored in internal computer memory，or transmitted electronically across a medium such as a telephone line．This multiplicity of targets makes computer security difficult． 28ja-1dB  
　　In any security system，the weakest point is the most serious vulnerability．A robber intent on stealing something from your house will not attempt to penetrate a two-inch thick metal door if a window gives easier access．A sophisticated perimeter physical security system does not compensate for unguarded access by means of a simple telephone line and a modem．The“weakest point”philosophy can be restated as the following principle． R08&cd#$  
　　Principle of Easiest Penetration．An intruder must be expected to use any available means of penetration．This will not necessarily be the most obvious means，nor will it necessarily be the one against which the most solid defense has been installed[1]． p?}f|mQS)  
　　This principle says that computer security specialists must consider all possible means of penetration，because strengthening one may just make another means more appealing to intruders[2]．We now consider what these means of penetration are．

对计算机犯罪的目标可以是计算机系统的任何部分。计算机系统是指硬件、软件、存储媒体、数据和部门中用计算机去完成计算任务的人的集合。银行抢劫的目标显然是现金，而储户姓名和地址清单对竞争的银行来说是很有价值的。这种清单可以是书面上的、记录在磁介质上的、存储在内存中的或通过像电话线那样的媒体以电子方式传送的。这么多的目标使得处理计算机安全问题很困难。 :,jPNuOA  
任何安全系统，最薄弱点是最致命的。一个强盗要偷你房间中的东西，如果破窗而入更容易，他绝不会穿过两英寸厚的铁门。很高级的全范围实物安全系统并不能防范通过电话线和调制解调器这种简单的无设防接入。最“薄弱点”法则可用下述原理描述。 J`4Z<b53  
最容易渗入原理。入侵者必定要使用一种可以渗入的方法，这种方法既不一定是最常用的，也不一定是针对已经采取了最可靠防范措施的。 Y
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这一原理说明计算机安全专家必须考虑所有可能的攻击方法。也许正是由于你加强了某一方面，入侵者可能会想出另外的对付方法。我们现在就说明这些渗入的方法是什么。

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