Feature Suggestion: Mitigations for the security issues with Bluetooth about espruino HOT 1 CLOSED

Hi, I really think you're being overly paranoid here. Bluetooth LE is used by billions of devices, and I think there would be a bigger uproar if there were realistically exploitable issues if it was set up properly.

The PIN is 6 digits, and enabling it also forces the need for encryption on the data channel to the Bangle. I really think the encryption used which has been tested on all those billions of devices is superior to what we might be able to come up with - but everything is open so if you really want to implement something on top, you're more than welcome to.

Connecting and pairing takes maybe 2 seconds at least, so for someone to brute-force all 1 million pairing keys would take them a month, 24 hours a day, within range of your disconnected Bangle.

If you wished, you could come up with an app which cycled the pairing key automatically every day too.

Implement a killswitch that would disable Bluetooth when it is not needed.

• There's an option in settings that allows you to turn Bluetooth off
• There's also setting Programmable:No which removes the REPL from bluetooth and restricts access to just the JSON that can be passed from Gadgetbridge, which would seriously limit any possible damage.

So honestly, it seems like there are more security options than you thought, and I don't think there's much extra I can really add for the Bangle here. If you want to add extra features on top yourself, you're welcome to though.

from espruino.