Securing the nRF9160 against physical access

It's impossible to completely secure a device against an attacker with physical access. But you can make it difficult and expensive. Imagine that you have secured communications between your nRF9160 and your server using mutually authenticated TLS. That's great, until someone gains physical access to the device and reads your private key from flash. Even if you store your key in write-only1 memory, an attacker can still run their firmware on the device and use the key. »