In modem firmware update sample for nRF9160 gives info about to use non-secure(ns) board.
In non-secure(ns) board, it create two environments inside the CPU that can run isolated from each other: a secure and a non-secure environment.
Have gone through SPM[https://developer.nordicsemi.com/nRF_Connect_SDK/doc/1.8.0/nrf/libraries/others/spm.html] but could not identify what feature does secure domain provides in addition to make isolate from non-secure domain.
Question:
1) What is the meaning of secure environment ?
2) Is secure domain contain data in encrypted format ?
3) Is secure partition data signed by any signature keys ?
4) Does secure partition use any hardware to provide security ?
5) Is secure partition provides security on hardware level or on transport layer ?
