@d00616 said in Better security without the need of a cryptoprocessor: out-of-band authentication: For long range sub GHz is the better choice. This is physics. You are right. But almost in every country RF laws allow to use 2.4G transmitters up to 100mw (+20dbm) without permitions. It would extend the range a lot. Please help by reporting the issues you have found, so we can create stable 32 bit platform support. I will try