NSA Whistleblower Edward Snowden is among the backers of a new surveillance app that helps guard against computer hijackings.

Haven is an open source app that will run on any Android phone, particularly inexpensive and older devices. It operates like a surveillance system, using the device’s camera, audio recording capability and even accelerometer to detect movement and notify a user. The idea is that, even with the best encryption in the world, a device is vulnerability to physical, in-person tampering — also known as “evil maid” because literally a hotel maid could access it.

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