Since its inception almost five years ago, the Linux microPlatform™ has been leveraging secure boot and the PKCS#11 API for securely storing and managing IoT Keys and Certificates. On ARM/RISC-V, OP-TEE became our preferred implementation to access Secure Storage, Secure Elements, Enclaves and Cryptographic Cores. On other platforms, we recently up-streamed support for TPM2 devices and it is now our choice as a secure back-end to the API when OP-TEE is not available.