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

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

admin2010-10-28  10
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.  
The advantage of using banding patterns to trace documents is that ______.
选项 A、it is economically affordable and technically practical
B、it strengthens the collaboration between printing companies
C、it makes printers cheaper and hard to be taken around
D、it is able to identify even the most specialized criminals
答案A
解析 原文第五段末尾一句说“利用打印机频带模式来确保文件的安全性。不仅在安装上成本低，而且那些没有专业知识和硬件的罪犯很难，如果不是不可能的话，逃脱”。由此可以推测出利用频带模式追踪文件的优势在于经济上可以承受而且技术上可行。故A项含义与之相符，为正确答案。
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