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Don't close your MacBook with a cover over the camera

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Re: Don't close your MacBook with a cover over the camera

#331

Earlier quoted context omitted.

I think cameras are generally expected in non-budget laptops just as they are in phones.

Unfortunately, they're not even as good as phone front cameras because laptop screens are so thin. So people who do a lot of video chatting typically set up an external webcam or even a real camera in video mode.

Do you have statistics on this? And do they take into account the dichotomy of mostly-mobile and mostly-stationary users?

Re: Don't close your MacBook with a cover over the camera

#332
post #266
post #169

Earlier quoted context omitted.

Hi! I was the security architect for this feature on recent Macs. The LED is wired to the camera PMIC and is powered by the voltage rail that powers the camera. The PMIC will always remain on if the system has power. Macs newer than 4 or so years also have a feature that forces the LED to stay lit for at least 3 seconds after it has been turned on to prevent the single-frame-grab attack.

> to prevent the single-frame-grab attack. prevent? by the time the LED turns on, the attack has already happened.

Prevent it from being undetectable

Re: Don't close your MacBook with a cover over the camera

#333

Seriously Apple, just stop blaming your users. Camera covers are a totally reasonable response to the threats we all face. If your precious computers can't have them installed, build one in. I am a longtime Apple hardware user, but it's just getting so hard to keep using them...

Where the blame? Apple shouldn’t warn users?

Re: Don't close your MacBook with a cover over the camera

#334
post #313

Earlier quoted context omitted.

it was hacked in the past - that's the point of the above comment No guarantee it can't be hacked again.

There is a guarantee because there’s no way to bypass the wiring to the light to power the camera.

Indicator of use doesn't block a hack, just let you know it happened.

Re: Don't close your MacBook with a cover over the camera

#335

> The camera is engineered so that it can’t activate without the camera indicator light also turning on. Has anyone torn down the hardware and verified this lately? It should not be a complicated feature at all. Just ensure you have the same voltage applied to your LED circuit as your camera circuit, and enforce that by having them on the same wire...

It's not that simple, what voltage and current need to held on that wire to light the LED and the camera? It's not uncommmon to find a situation where a chip doesn't technically have the right power on it's power rails, but is instead drawing power on the input ports. It's non-trivial to prove this is or isn't happening.

No, I think it is that simple. The camera module likely needs either 3.3v or 5v. The LED can also be powered at either 3.3 or 5v by simply using a series resistor. You just hook the camera and LED to the supply in parallel.

> a chip doesn't technically have the right power on it's power rails, but is instead drawing power on the input ports.

What does this mean? The data lines of camera modules are generally differential pair, and it is highly unlikely that significant power is being drawn from them.

Re: Don't close your MacBook with a cover over the camera

#336
post #23

> "Designed to protect your privacy, Mac notebooks have a camera indicator light to let you know when the camera is on. ... Published Date: July 02, 2020" Perhaps Apple missed these? 2013: iSeeYou: Disabling the MacBook Webcam Indicator LED https://jscholarship.library.jhu.edu/handle/1774.2/36569 2016: Your Mac’s Camera Can Be Hacked https://www.intego.com/mac-security-blog/your-macs-camera-ca... 2016: Former NSA emp…

If you read to the bottom of the directions it says you can use a sticker. So this looks like its targeted to the plastic camera covers that can be turned on and off.

Yes, tearing off a small piece of a post-it note seems ideal.

Re: Don't close your MacBook with a cover over the camera

#337
post #111

Earlier quoted context omitted.

> Designed to protect your privacy, Mac notebooks have a camera indicator light to let you know when the camera is on. ... The main problem with that isn't that it is possible to disable the LED. The problem is that the LED is like a smoke detector, when it alerts you it's already too late, you are on fire (or your photo/video has already been taken). An indicator LED doesn't protect your privacy, it only tells you w…

...and it only tells you that if you are looking at it at the time.

Indeed. Think of the “American Pie” situation. Laptop open playing Spotify to get you in the mood, then bop, on goes the camera thanks to a bug in zoom. Are you going to notice?

Re: Don't close your MacBook with a cover over the camera

#338

How does the smart backlight can adjust luminosity without triggering the webcam's indicator then ? (genuenly curious, I don't know how it works)

I think the sensors are located near but not part of the camera assembly. Covering the camera is also likely to cover the light sensor.

Re: Don't close your MacBook with a cover over the camera

#339
post #295

Earlier quoted context omitted.

As long as you maintain physical possession of your machine, point 3 is moot, at least on Macs.

See the several articles linked in this page about apple webcams/mics being turned on by hackers.... Apple is good, but they are not perfect

They are not, but these articles are for < 2008 Macs. On "newer" Macbooks it done by hardware.

Re: Don't close your MacBook with a cover over the camera

#340

After reading this help article by Apple I will sell all my Apple devices and never buy anything again from them. This post by Apple is confirmation to me that they were spying though the camera. In recent years I have seen more and more people do this with nearly every single Mac owner I know doing this (and that's a lot of people). I don't think it's Apple conducting the espionage but rather LEAs of totalitarian un…

Since Mac camera indicator lights are hard wired to camera power supply, your theory is impossible.
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