According Georgia Tech researchers, that common scenario could let hackers record almost every sentence you type, all thanks to your smartphone's accelerometer.

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Sign up for a Twitter account, type in a sentence or two as you would in any normal email and hit the send button.

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After being asked to type in a five-sentence-long code sequence, the students get restless and start cracking jokes.

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"There's a maximum of 14 years for this type of crime and from figures we've had from the Ministry of Justice, that maximum sentence has never been used, " he said.

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