Now you can set your Golioth credentials from the Zephyr device shell. You also have the option to pull them from the Golioth cloud and automatically send them to the device from a single command on the command line. These new features use the Zephyr settings subsystem where they are stored in flash memory so that they persist after rebooting.
Vit Prajzler, CTO of Golioth, explains the concept of a Pre-Shared Key (PSK) and how it lends a simple but flexible amount of security for prototypes on the Golioth network. IoT prototypes on the Golioth platform are "Secure by default".