#科技头条#20150221

#科技头条#【汗!手机耗电情况会泄露你的位置】很多智能手机用户不愿意让应用程序通过GPS获取自己的活动信息,但研究人员发现,安卓手机会把用户的地理位置泄露给设备上已安装的所有应用程序,且通过一种不太可能的数据泄露渠道:手机电量消耗情况。目前谷歌尚未对此做出回应。

Could your phone's BATTERY let spies track your every move? Changes in power can pinpoint your location to 90% accuracy
http://www.dailymail.co.uk/sciencetech/article-2962390/Could-phone-s-BATTERY-let-spies-track-Changes-power-pinpoint-location-90-accuracy.html

Many of us will think twice before allowing a mobile app to have access to our location data.

But it’s not just apps we need to worry about – hackers can now track our every move through our phone’s power consumption.

 

Unlike GPS or Wi-Fi location tracking, power data is freely available to any installed app allowing anyone with the know-how ti track a phone location to 90 per cent accuracy.

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Researchers at Stanford University and Israel's defence research group, Rafael, have named their technique 'PowerSpy', according to a report by Wired.

It works because a phone's transmission requires more power to connect with a cell tower that is farther away.

It also requires more power when obstacles such as block its signal.

This means that temporary power drains, such as a phone call, will help highlight the type of environment the mobile phone user is in.

'A sufficiently long power measurement (several minutes) enables the learning algorithm to 'see' through the noise,' the researchers write.

'We show that measuring the phone's aggregate power consumption over time completely reveals the phone's location and movement.'

The researchers collected power data from Android phones as they drove around California's Bay Area and the Israeli city of Haifa.

Then they compared their data with the power consumption of an LG Nexus 4 handset as it repeatedly travelled through one of those routes.

They were able to guess which route it was nine out of ten times.

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The technique only works if the person being spied on has travelled that route before, and hackers have measured how power consumption changes along that route.

If they don't know your routine, that accuracy of location drop from 90 per cent to about 60 per cent.

Someday, the scientists claim spies could use PowerSpy to track targets, or apps could use its location tracking for advertising purposes.

'You could install an application like Angry Birds that communicates over the network but doesn't ask for any location permissions,' Yan Michalevski, one of the Stanford researchers told Wired.

'It gathers information and sends it back to me to track you in real time, to understand what routes you've taken when you drove your car or to know exactly where you are on the route.'

Last year the same group found that they could use the gyroscope in a phone as a basic microphone. 

The 'gyrophone' could recognise spoken digits and distinguish between male and female voices. 

 


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