Comment by philsnow
5 years ago
It looks like disabling airdrop doesn't do anything:
> All iOS devices are constantly receiving and processing BLE advertisement frames like this. In the case of these AirDrop advertisements, when the device is in the default "Contacts Only" mode, sharingd (which parses BLE advertisements) checks whether this unsalted, truncated hash matches the truncated hashes of any emails or phone numbers in the device's address book.
Then follows the section on brute-forcing 2 bytes (only) of a SHA256 hash.
Spray noise on channels 6 and 44?
I don't think that proves what you think it does - that's with AirDrop on, but in a limited mode.
If you turn AirDrop/Bluetooth off, you may well disable this.
On my phone:
- If you disable Bluetooth in the notification tray, then it goes to Bluetooth "Not Connected", but not Off. - If you disable Bluetooth in settings, AirDrop automatically goes into "Receiving Off". - If you then enable AirDrop, it'll automatically turn Bluetooth on.
So I don't think it's true that you can't disable it - unless the UI is misleading about Off.