BLE minimal modifications to use pre shared key auth and encryption

[Fabien Comte]

Hello,

I have a nRF52 to nRF52 connection. I want to secure it (auth and if possible encryption) with a pre shared key. What are the points that I have to modify please ?

Thank you.

[Petter Myhre]

With auth I'm assuming you mean authentication, not authorization. What exacly do you want to secure? What kind of attacks do you want to protect against? Do you want to prevent unauthenticated devices to connect to you? Or do you want to protect some data (characteristic values)?