I want to use a nRF9160 to send data over UDP/NB-IoT.
For encryption I want to use eclipse/tinydtls in order to have support for RFC7250 and (upcoming) RFC9146. That works with software ecc (so far). However the software ecc-functions takes a couple of seconds (more or less expected). Therefore, I would like to try to use the ecc-hw-accelerator.
As far as i understand 1.6 Secure vs. nonsecure ,
"However, this feature is more critical when building applications for the nRF9160, since cellular IoT applications has to be build as non-secure in order to communicate with the modem."
it seems to be not possible to access the ecc-hw from such an cellular IoT application, because that must be on non-secure and there the hw-ecc is not available (right?).
It is somehow hard to understand, why cellular IoT applications has to be build as non-secure. Is there a more detailed explanation about that as "in order to communicate with the modem"?
I read also, that maybe mbedtls could use the ecc-hw for crypto functions. But it leaves it unclear to me, if this is then also limited to the "secure mode" and so also not usable in a iot-application itself.
