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Nowadays, no document is safe any more. Counterfeiting, once the domain of skilled deceivers that used expensive engraving and p

admin2009-08-19  78
问题    Nowadays, no document is safe any more. Counterfeiting, once the domain of skilled deceivers that used expensive engraving and printing equipment, has gone mainstream since the price of desktop-publishing systems has dropped. In ancient times, counterfeiting was a hanging offence. Today, desktop counterfeiters have little reason to worry about prison, because the systems they use are ubiquitous(普遍存在的)and there is no means of tracing forged documents to the machine that produced them. This, however, may soon change thanks to technology development by George Chiu, an anti-counterfeiting engineer.
   His approach is based on detecting imperfections in the print quality of documents. Old-school court scientists were able to trace documents to particular typewriters based on quirks (沟槽) of the individual keys. He employs a similar approach, exploiting the fact that the rotating(转动)drums and mirrors inside a printer are imperfect pieces of engineering which, leave unique patterns of banding in their products.
   Although these patterns are invisible to the naked eye, they can be detected and analyzed by computer programs, and it is these that Dr. Chiu has spent the past year devising. So far, he cannot trace individual printers, but he can tell pretty reliably which make and model of printer was used to create a document.
   That, however, is only the beginning. While it remains to be seen whether it will be possible to trace a counterfeit document back to its guilty creator on the basis of manufacturing imperfections, Dr. Chiu is now working out ways to make those imperfections deliberate. He wants to modify the printing process so that unique, invisible signatures can be incorporated into each machine produced which would make any document traceable.
   Ironically, it was after years of collaborating with printing companies to reduce banding and thus increase the quality of prints, that he Came up with the idea of introducing artificial banding that could encode identification information into a document. Using the banding patterns of printers to secure documents would be both cheap to implement and hard, if not impossible, for those without specialist knowledge and hardware to evade.
   Not surprising, the American Secret Service is monitoring the progress of this research very closely, and is providing guidelines to help Dr. Chin to travel in what the service thinks is the right direction, which is fine for catching criminals. But how the legitimate users of printers will react to Big Brother being able to track any document back to his source remains to be seen.
选项 A、affordable printers makes it possible for anyone to forge documents
B、the American Secret Service will be able to trace any document
C、every printed document will be secretly marked out through high-tech
D、counterfeiters have more advanced technology to use
答案A
解析 由题干中的no document is safe any more定位到原文首段首句No document is safe any more.题干no document is safe any more(任何文件都不再安全)强调造假的普遍性，联系原文首段第二句“造假，本来是使用昂贵的篆刻和印刷机器的专业罪犯的领域，现在已经由于台式印刷系统价格的降低而成为主流”由此推断A)“买得起的打印机使每个人伪造文件成为可能”含义与之相符。[避错]B)“美国保密局将能够追踪任何文件”含义绝对化，且不能构成文件不安全的原因，故排除；C)“任何印刷的文件都会被利用高科技秘密地标记出来”含义绝对化，原文没有提及，故排除；D)“造假者可以利用更加发达的科技”没有点到价格这个使其普遍化的主要因素，故排除。
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