Hello,
I will use the STM32WL33CCV6 as a wM-Bus gateway and the STM32WBA50KG for BLE 5.4 communications.
We will encrypt these links with AES key.
1) For STM32WL33CCV6 and wM-Bus, AES-128-CBC and eventually CMAC authentification will be used. It will be static or dynamic symmetric keys.
--> Is it possible to store the keys in the STM32WL33CCV6 MCU ? we want to be secure, especially to respond to the RED 2.
--> If yes, is it possible to store several keys ?
--> If yes, in the case of dynamic key use, is it possible to update the keys ?
2) For STM32WBA50KG and BLE, AES-128 or 256 bits will be used.
--> To respond to the RED 2 AES128 is sufficient or AES-256 is needed ?
--> Compared to the STM32WL33CCV6, I think it's possible to store the key in the MCU, it seems to be a dedicated secure key storage, can you confirm ?
Best Regards,
