Apple (via MacRumors, Hacker News):
If you close your Mac notebook with a camera cover installed, you might damage your display because the clearance between the display and keyboard is designed to very tight tolerances. Covering the built-in camera might also interfere with the ambient light sensor and prevent features like automatic brightness and True Tone from working. As an alternative to a camera cover, use the camera indicator light to determine if your camera is active, and decide which apps can use your camera in System Preferences.
[…]
The camera is engineered so that it can’t activate without the camera indicator light also turning on. This is how you can tell if your camera is on.
Even assuming there’s no way around that, the light only provides protection when you happen notice it. This will be some time—possibly short or possible very long—after the camera had started recording. If the software simply takes a photo and turns the camera back off, you might not notice the light flash even when sitting at the computer.
If you install a camera cover that is thicker than 0.1mm, remove the camera cover before closing your computer.
I’ve been using a piece of electrical tape, which Wikipedia says is between 0.18mm and 0.25mm thick. I’m not sure what you could use that would be thin enough to leave on.
None of the proposed solutions do anything to actually stop the camera from taking a picture of you. Sure, you’ll see the indicator light up for 3 seconds. But the attacker still got what they needed.
Camera covers have nothing to do with identifying compromise. They are strictly for preventing compromise. This is exactly opposite what a camera indicator light does, and thus the indicator should not be considered a “workaround” for not being able to install a camera cover.
I was very skeptical of the camera covers, but then through conversations with some of my co-workers, I realized that they weren’t being used because people were worried about spies secretly turning on the camera. It was 90% of the time just peace of mind that their camera was actually off, instead of having to find the sometimes hard to see options in video chat programs etc.
Previously:
- iPad Pro 2020 Includes Microphone Hardware Disconnect
- On Covering Webcams
- iSights Spying on Their Users Without Warning
Update (2020-07-29): Simone Manganelli:
Even if there were a big omnipresent, easy-to-access button in the menu bar that would turn off the camera, sometimes the OS hangs, or is slow to respond to a button click, and those seconds can be make-it-or-break-it for a huge embarrassment.