密码和手势锁屏已经过时何不试试更安全的涂鸦锁屏

2014-07-08 17:22:53来源：可可英语

　　To measure each gesture’s level of security, the researchers imported a concept from Information Theory called “differential entropy.” This metric quantified the “information content,” or “surprisingness,” of a gesture. Generally, the most secure gestures were the most complex. Some of these looked like brambles, tumbleweeds or multi-faceted jewels.

　　为了准确衡量每种手势的安全性，研究人员引入了信息论中的“微分熵”概念。这个概念能量化手势的“信息内容”或者说“多样性”。一般来说，越复杂的手势越安全，它们有些看着像荆棘、风滚草等植物，还有些看起来像是有很多面的珠宝。

　　On average the most memorable gestures were shorter and simpler than those best for security. Some of the most memorable ones included simple angular shapes, like triangles, and signatures.

　　通常，与最安全的手势相比，那些最容易记住的手势一般比较简洁，其中包括简单的图案造型，例如三角形和签名等。

　　The least-secure gestures consisted of gentle, looping circles.

　　而最不安全的手势则要数单调循环的圆圈。

　　Another measure of security involved a “shoulder surfing” test. Six student volunteers independently watched videos of another student performing three representative gestures. These “attackers” were then asked to replicate each gesture.

　　另一种衡量安全性的方法是所谓的“背后偷窥”测试。方法是让六名学生志愿者独自观看一位学生演示三种典型手势的视频，然后凭记忆重复这些手势。

　　The preliminary results were promising. “None of the attackers came even close to the gesture,” Lindqvist said.

　　初步测试的效果令人振奋。林奎斯特称：“偷窥者们甚至都无法画出相近的手势。”

　　In fact, one attacker did nearly replicate one of the gestures—a backwards “N”—but did not come close enough for a “recognizer” to authenticate.

　　事实上，还是有一人几乎画出了其中一种手势——一个倒写的字母“N”，但相似度没有达到系统“识别”通过的程度。

　　“Typing in a password seems to be an artifact of the past,” said Nasir Memon, professor of computer science and engineering at New York University, who was not involved in the study. “There is definitely a need to explore the alternatives.”

　　纽约大学(New York University)计算机科学与工程专业教授纳西尔o梅蒙说：“输入密码已经过时了，我们亟需发掘替代方案。”梅蒙并没有参与上面提到的研究。

　　Still, even with the aid of muscle memory, one must question how confusing a world of security gestures might become.

　　不过，即便有肌肉记忆辅助，我们也可能会被一大堆手势密码弄得不知所措。

　　“If you have three different gestures for three different accounts, how do you deal with that?” Memon asked.

　　梅蒙反问：“如果你的三个账号有三个不同的手势密码，你怎么区分?”

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