Let us take this a step further…your system security is only as strong as the weakest link.  Even if you have a very robust hardware security solution on the client side, if you store your host keys in unsecured memory, the keys can be read! Validation of the cryptographic protocols can be both time consuming and take extra code space. You can quickly achieve much stronger host-side security by using cryptographic memories designed specifically to protect secrets. Hardware security ICs are specially designed with metal shields, internal encryption, tamper protection and other internal hardware features are nearly impossible to copy. And since they provide a turnkey implementation of a proven cryptographic protocol, design time is much shorter.