Security firm SensePost has unveiled its Snoopy drone, which can steal data from unsuspecting smartphone users, at the Black Hat security conference in Singapore.
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The drone uses the company's software, which is installed on a computer attached to a drone.
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That code can be used to hack smartphones and steal personal data - all without a user's knowledge.
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It does this by exploiting handsets looking for a wireless signal.
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He says he wants to "talk about this to bring awareness" of the security risks posed by such simple technologies to users.
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His advice? Turn off the wireless network on your phone until you absolutely need to use it.
Turn off the wireless network on your phone until you absolutely need to use it.