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This is covered in the paper. They acknowledge this defense technique while also pointing out that a laser flashlight could be used to illuminate all microphone
by MauranKilom 7y ago
This is covered in the paper. They acknowledge this defense technique while also pointing out that a laser flashlight could be used to illuminate all microphones at once.
- deleted 7y ago[deleted]
- penagwin 7y agoThe power output would need to be much higher and I'm not sure it'd work as well through glass, I'm thinking something more like multiple lasers?
- rmsaksida 7y agoWhat about internal microphones?
- dantle 7y agoPerhaps the "all at once" attack could work against today's hardware. This is because the mics (in devices I know of) are co-planar and the user may be speaking to Alexa (or whoever) from directly above or below the device. In this configuration, it is valid for all mics to be receiving the same audio signal simultaneously. But in some future rev, one could imagine that if the mics in the array are non-coplanar (e.g. at least 4 mics) and sufficiently far from each other, then there is no possible way for the audio signal to reach them at once (unless it is actually light being measured).
- MauranKilom 7y agoYou could add timing difference to individual lasers as necessary. It's not really more complicated than duplicating the laser setups and feeding them the same signal with time delays. Not a huge step. However, non-coplanar mics would work for the opposite reason: If they are on different sides of the device, you couldn't reach all of them from the same distant location. So unless all mics receive (more or less) similar sound signals, you could discard it as manipulation.