> Because where do you store the CPU side private key after the exchange for future sessions?
eFuses, maybe? Or a bit of battery-backed SRAM. Lots of devices have a small amount of hardened storage for e.g. encryption keys. FPGAs supporting bitstream encryption and Atmel's ATSHA device line are examples.
> CryptoAuthentication devices have full metal shields over all of the internal circuitry, so that if an attacker cuts or short circuits any trace in the shield, the product stops functioning.
eFuses, maybe? Or a bit of battery-backed SRAM. Lots of devices have a small amount of hardened storage for e.g. encryption keys. FPGAs supporting bitstream encryption and Atmel's ATSHA device line are examples.
> CryptoAuthentication devices have full metal shields over all of the internal circuitry, so that if an attacker cuts or short circuits any trace in the shield, the product stops functioning.