Secure advertising packets

[pltv]

Whats the best way to secure my advertising packets such that others cannot make sense out of it?

Do we encrypt the packet data so that it is gibberish, random and not in any particular format so others cannot make sense of it?

[uriy]

I also need secure data transmitting in advertise packets. I'm going to use encrypted manufacturer data field

[pltv]

Could you explain a bit more on the encrypted manufacturer data field. Is there a specific field like that part of the BLE protocol?

[uriy]

devzone.nordicsemi.com/.../ Manufacturer Specific Data

[Ole Bauck]

You can encrypt the data in the packet by following the steps in this blogpost (you should read the whole blogpost as it has many good points).

You should also use private resolvable address if you don't want unknown scanners to be able to track your device, see here.