Live data from Hacker News

Always-on Processor magic: How Find My works while iPhone is powered off

naehrdine.blogspot.com

71–80 of 267 posts

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#71

Earlier quoted context omitted.

Apple has made it easier for users to locate lost (by being misplaced, forgotten, or stolen) devices with a feature that the user can opt out of on a temporary or permanent basis. What is controversial about this?

Many will misinterpret it. We have seen how much the public can fundamentally misunderstand technical information over the past year. People will just see that: 1. You can never disconnect your iPhone from the grid and stop it from being tracked. Even if you turn it off. 2. Governments, companies, and other (from the conspiracy theorist's standpoint) will be able find you whenever they want. I am sure there are some…

> 1. You can never disconnect your iPhone from the grid and stop it from being tracked. Even if you turn it off. 2. Governments, companies, and other (from the conspiracy theorist's standpoint) will be able find you whenever they want.

Ok, I'll bite and play the conspiracy theorist. What reasonable steps prevent some three letter agency (or Apple itself for commercial reasons) from abusing the Find My network to do exactly that?

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#72
post #49

So according to the post iphones now have an AOP (Always on Processor) running a proprietary operating system with access to other phone components. Do we know if other manufacturers also include such a processor? A quick google search showed a relevant apple patent [0] and a similar qualcomm processor product for wearables [1] which suggests to me this (always on processors on consumer electronics) "is out there ...…

Not for phones or wearables, but https://en.wikipedia.org/wiki/Intel_Management_Engine:

“The Intel Management Engine (ME), also known as the Intel Manageability Engine, is an autonomous subsystem that has been incorporated in virtually all of Intel's processor chipsets since 2008.

[…]

The Intel Management Engine always runs as long as the motherboard is receiving power, even when the computer is turned off.”

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#73
post #56

Earlier quoted context omitted.

You mean "a little bird told you I was going to get rate limited", don't worry I gotchu.

No, HN will rate limit you if you post too quickly. I've been hit with it when I was involved in a back-and-forth in the past (part of the reason I added a 2-minute delay to my posts becoming visible, plus it gives me a chance to reconsider if they're worth posting or make edits).

I know. I was just being deliberately annoying. Matthew Green's twitter thread includes an incorrect (but he has now walked it back since he's obviously now read the teardown we're supposed to be discussing here and which I've played my fair share in derailing) post about how "a little bird told him it works this way". Just more twitter bravado at the time.

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#74
post #28

Earlier quoted context omitted.

The Find My Network is, basically, every Apple device out in the world. Using bluetooth in this fashion, all the other devices participating in the network and in the area of the phone (or AirTags, they work similarly) will receive the bluetooth broadcast. They'll then communicate that to Apple's system. So when you go to find your device, its most recent known location can be provided to you. They've got some crypto…

Do you mean that every Apple device in the world acts as a proxy to forward Bluetooth requests from nearby (off) devices containing their location, automatically? E.g my laptop is pinging data to Apple about random nearby phones all the time that it sees with Bluetooth?

And all of the data is encrypted so that no one other than the actual device owner can get any of the location information for their device. No one else, including apple can locate a device using the find my network.

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#75
post #12

Yep, that's not going to spark conspiracy theories and damage the brand at all, just like the backdoor they've recently put in. /s Again, why would $3T company damage its brand like that? It's not "for children" and certainly not to "find your phone". There's something going on there.

Apple has made it easier for users to locate lost (by being misplaced, forgotten, or stolen) devices with a feature that the user can opt out of on a temporary or permanent basis. What is controversial about this?

> What is controversial about this?

I'll predict that almost no one opted out of this for the simple reason that they didn't know this feature even existed. This is the "Hitchhiker's guide to the galaxy" method of faking consent.

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#76
post #10

Do not try and power off the device. That’s impossible. Instead... only try to realize the truth. The truth? There is no off. From the Matrix, or something.

Sure you can power off your device! Just take out the batt-- oh...

Swappable battery is a trend that should return- to both phones and electric vehicles.

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#77
post #37

Earlier quoted context omitted.

If there is such a capability (a rather technically involved one, I might add, all the way down to the silicon), do you really believe Apple can't turn it on at CIA/NSA's request without popping that dialog? And you wouldn't even know due to gag orders. And before you say this can't happen in the US, I can give you a few publicized examples of illegal spying on US citizens just in the past few years.

People have been carrying around portable GPS devices in their pockets for over a decade now. This threat is not new, and if you fear it, don't carry around a GPS device or one that will connect to other devices to get its location reported to a central server.

In other words, don't use modern technology?

Don't you think there should be a law so a device has to at least indicate it has an "always on" component?

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#78
post #15

Very interesting read. This seems to be implemented as a Bluetooth LE app running on the ultra-low power “always on processor” used for a variety of features, like “wake-up on motion.” Much like an Tile or AirTag is implemented. No comment on what this is capable in the future.. but for now this shows power usage / signal strength / proximity of other “actually on” devices are a limitations of this feature. What’s im…

> I’ll be pretty shocked if I’m “spied on” with this style of device.

Why? There's plenty of devices in the wild constantly looking for wifi connection attempts, BLE Scans. Even cellular provider track locations in real-time by logging what cell towers you're using and associated signal strength.

Just search for a place in google maps, and note the "Popular Times". How do you think they got that data :D

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#79
post #15

Very interesting read. This seems to be implemented as a Bluetooth LE app running on the ultra-low power “always on processor” used for a variety of features, like “wake-up on motion.” Much like an Tile or AirTag is implemented. No comment on what this is capable in the future.. but for now this shows power usage / signal strength / proximity of other “actually on” devices are a limitations of this feature. What’s im…

> I’ll be pretty shocked if I’m “spied on” with this style of device. Why? There's plenty of devices in the wild constantly looking for wifi connection attempts, BLE Scans. Even cellular provider track locations in real-time by logging what cell towers you're using and associated signal strength. Just search for a place in google maps, and note the "Popular Times". How do you think they got that data :D

The protocol they use explicitly protects against this attack vector.

Re: Always-on Processor magic: How Find My works while iPhone is powered off

#80
post #31

Earlier quoted context omitted.

Matthew Green wrote zerocash, the protocol behind zcash, and he teaches cryptography at John Hopkins. When it comes to cryptography he knows enough to have opinions. It's hard to opine about black box systems, which is why open-source is so important. It's hard to trust what you can't verify.

I don't disagree but like if you want an open system why are you using an iPhone? Maybe Green is a little guilty of slurping up Apple's privacy marketing?...

At this point, there's only two mobile OS players. All of these upstarts don't have enough market share to count (hopefully, just for now).

Nobody's family members use something other than iOS/Android. Maybe some of your friends do, but that's a small market.

With that established, just because one uses iOS/Android does not mean they are not about openess or security or privacy or whatever. It probably just means they are a human being that has only so much time in their life and they need a mobile device that works and operates with their friends and families. Just like why people continue to use FB/Twit/blah; that's where the people are.

Post reply on HN