Components, development cost, a small market, and profiteering. You’re talking about a hardened appliance meant to store encryption keys, sign transactions wit

Components, development cost, a small market, and profiteering. You’re talking about a hardened appliance meant to store encryption keys, sign transactions with those keys, and resist disclosure of the keys even if an attacker physically steals the device and, for instance, tries to retrieve the keys from something like an xray analysis of the chip. That’s the theory. In practice these things have been…Less than perfect. https://www.schneier.com/blog/archives/2019/06/hacking_hardwar.html https://www.schneier.com/blog/archives/2019/06/hacking_hardw...