黑客攻击过去通常指怪异的大学生在卧室里敲着键盘使用电脑来骚扰他们的长辈。
Hacking used to be about geeky college kids tapping away in their bedrooms to annoy their elders.
而且黑客似乎只能在塑料键盘上运用这个方法，因为金属会反射出大量的热量干扰波，从而使得红外摄相机无法准确识别。
And the hack only seems to work on plastic keypads — metal returns too much heat noise for the IR camera to reliably discern with keys were just pressed.
而每一名新的打字者和一个新键盘都需要处理新的文稿和训练，这就限制了这一解码方法对那些想要成为黑客的人们的吸引力。
Furthermore, each new typist or keyboard required a fresh transcript and training session, limiting the method's appeal to would-be hackers.
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