I know some security processors have an isolated bus where you can store a private key and use it with hardware encryption without the key ever being stored in memory. Some even have key storage inside the SoC on an isolated bus so there's no possibility of stealing it even with physical access and a team of engineers. This feature is commonly used to implement HDCP, for example.
Question: I was wondering if there's some feature like that in consumer-grade Intel or Arm-based platforms?
I'd like to be able to write a key and use it for encryption with almost no chance it could ever be recovered.