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8-11 我认识你吗?

时间:2006-10-17 16:00来源:互联网 提供网友:toad   字体: [ ]

Do I Know You?


With computer security threats lurking1 around every electronic corner it is no wonder that so many online activities, from signing into your e-mail to checking your bank account, require a secure log-in with a password. But passwords can be stolen or forgotten, and most of us are not about to shell out1 for a high-tech2 retinal2 scanner3. So Israeli scientists in Haifa4 have created a program that lets a computer recognize you as its rightful user based simply on the way you type.


The human brains behind this artificial brain are two undergraduate students. They came up with the idea of a program that recognizes users by their keystrokes and took it to a professor of computer science. The professor and other scientists realized that any standard computer already monitors the time it takes a user to press and release a key. Their innovation was to create a program that records the details of keystroke timing3 and turns them into a distinctive45 user profile. Variables such as the length of your fingers, the size of your hands, your fine motor skills, your knowledge of the keyboard, and your fluency5 in the language being typed all affect your keystroke rate and pattern and define your rhythm on the keyboard as uniquely your own.


If the person working on the computer fits your profile, the program will signal a positive ID; if the program senses a mismatch, it could be used to block access to sensitive files. The great appeal of this security system is that it does not require the user to do anything out of the ordinary. You go about business as usual while the computer does all the work. “One can obviously deliberately66 type in a way that differs from how one normally would, but it’s really very hard to type like somebody else,” the scientists say. “This program picks out superimposed7 patterns unique to an individual user.”


The researchers tested the program by allowing five authorized78 users to type simple sentences, permitting the system to learn their typing habits. They then asked the five authorized users and 30 mock9 attackers to type out answers to simple open? ended questions such as “ What did you do today?” as well as a specific letter sequence: “To be or not to be. That is the question.” Both groups were then allowed to type whatever they wished. Within a few minutes of typing, the program had collected enough data to recognize authorized users 95 percent of the time and to block attackers in 99 percent of the test sessions.


This security system can also be equipped with an alert function to notify the authorized user when an attacker attempts to get access to his or her account. The scientists are also working on a companion program that would recognize patterns in computer mouse usage, which could prevent a stranger from clicking on folders8 to view sensitive files. In fact, there’s no reason why this approach must be limited to computers. The more complex the interaction, the easier it is for the system to identify someone because the variability is so great. The scientists aim to develop a program that allows a car to recognize its owner based on characteristic patterns of braking10, accelerating11, signaling, turning, and other essential driving actions.



1. shell out  (),付()

2. retinal [`retInEl] a.  视网膜的,视网膜上的

3. scanner [5skAnE] n.  扫描设备

4. Haifa [5haifE] 海法 [以色列港市]

5. distinctive [dis5tiNktiv] a.  特别的,有特色的

6. deliberately [dI5lIbErEtlI] ad.  故意地,蓄意地

7. superimposed [7sju:pErim5pEuzd] a.  叠置的,重叠的,附加上的

8. authorized [5C:WEraIzd] a.  经授权的,经委托的

9. mock [mCk] a.  假的,假装的

10. brake [breik] vi.  刹车

11. accelerate [Ak5selEreit] vi.  加速,增速










1 lurking 332fb85b4d0f64d0e0d1ef0d34ebcbe7     
  • Why are you lurking around outside my house? 你在我房子外面鬼鬼祟祟的,想干什么?
  • There is a suspicious man lurking in the shadows. 有一可疑的人躲在阴暗中。 来自《现代英汉综合大词典》
2 high-tech high-tech     
  • The economy is in the upswing which makes high-tech services in more demand too.经济在蓬勃发展,这就使对高科技服务的需求量也在加大。
  • The quest of a cure for disease with high-tech has never ceased. 人们希望运用高科技治疗疾病的追求从未停止过。
3 timing rgUzGC     
  • The timing of the meeting is not convenient.会议的时间安排不合适。
  • The timing of our statement is very opportune.我们发表声明选择的时机很恰当。
4 distinctive Es5xr     
  • She has a very distinctive way of walking.她走路的样子与别人很不相同。
  • This bird has several distinctive features.这个鸟具有几种突出的特征。
5 fluency ajCxF     
  • More practice will make you speak with greater fluency.多练习就可以使你的口语更流利。
  • Some young children achieve great fluency in their reading.一些孩子小小年纪阅读已经非常流畅。
6 deliberately Gulzvq     
  • The girl gave the show away deliberately.女孩故意泄露秘密。
  • They deliberately shifted off the argument.他们故意回避这个论点。
7 authorized jyLzgx     
  • An administrative order is valid if authorized by a statute.如果一个行政命令得到一个法规的认可那么这个命令就是有效的。
8 folders 7cb31435da1bef1e450754ff725b0fdd     
n.文件夹( folder的名词复数 );纸夹;(某些计算机系统中的)文件夹;页面叠
  • Encrypt and compress individual files and folders. The program is compact, efficient and user friendly. 加密和压缩的个人档案和folders.the计划是紧凑,高效和用户友好。 来自互联网
  • By insertion of photocopies,all folders can be maintained complete with little extra effort. 插入它的复制本,不费多大力量就能使所有文件夹保持完整。 来自辞典例句
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