科学美国人60秒:非联网状态下电脑遭入侵-托福听力下载

　　科学美国人60秒中文翻译：

　　Connecting your computer to the Internet gives would-be spies an obvious entry point to your machine. 将你的电脑连接入网会给潜在间谍入侵提供可乘之机。

　　But other ways exist to snoop. 但窥探你电脑的方式并非只此一种。

　　Because even computers that aren't connected to the Internet broadcast their activity in the form of electromagnetic radiation. 因为即使是未联网状态的电脑也会通过电磁辐射这种形式使你的行踪变得一览无余。

　　Basically your computer is full of transistors. And they're switching current from high to low depending if it is a zero or a one of the bit that they're trying to execute. 电脑基本上是由晶体管所组成。如果这些晶体管传导的电流是零或是一个比特单位，电流就会从高到低进行转换。

　　Alenka Zajic, an electrical engineer at Georgia Tech. 乔治州技术学院机电工程师阿勒卡·扎伊克说道，

　　When you do that you're creating a voltage fluctuation and current fluctuation. 当你这样做的时候，实际上创造的是一种电压及电流的波动。

　　And that basically creates electromagnetic field. 而基础而言就是在创造电磁场。

　　By hooking an antenna and receiver up to a laptop, 将天线和接收器接入到一台笔记本电脑后，

　　Zajic and her colleagues were able to log the keystrokes of a computer in the next room, by measuring exceedingly tiny fluctuations in the computer's radiation. 通过测量电脑辐射产生极微小的波动，扎伊克和同事们就能对隔壁房间的电脑按键记录了如指掌。

　　The same technique can reveal which programs you're using, too. 同样的技术还可以告诉你使用过哪些电脑程序。

　　Every one of them has a different signature in electromagnetic fields. 每个应用程序在电磁场中都有着截然不同的信号。

　　So I can tell which application you opened by looking into the spectrum. 所以通过观察光谱，我们就能知道你使用过哪款应用程序。

　　The researchers quantified the signal available to eavesdroppers in a recent paper, 研究人员们在最近的一篇文章中将窃听者的可用信号进行量化，

　　presented at the IEEE/ACM International Symposium on Microarchitecture in the U.K. 最终在英国微体系结构IEEE/ACM国际研讨会上进行发表。

　　Of course, real spies at the NSA and the CIA probably already know about this trick, she says. 当然，美国国家安全局和中央情报局的间谍可能早就对这些烂熟于心。

　　But by alerting developers to the problem, it might be possible to mask these electromagnetic leaks. 但通过让开发人员们意识到这一问题，或许能够为这些电磁泄漏进行遮丑工作。

　　And keep your computer's activity to yourself. 并且确保使用者计算机的安全。

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