That&#x27;s not correct.<p>It&#x27;s perfectly possible and trivial to put in a backdoor that only works for people who have access to a specific private key.<p>Obviously if that private key gets stolen anyone can then access the backdoor, but that&#x27;s true for anything, and you can mitigate it by storing the key in self-destructing immovable hardware with access limitations, as well as periodically changing the keypair (with signed updates).<p>The real problem is that there is no single &quot;good guy&quot; to entrust with that private key: in particular humans are inherently not fully trustable or good and both individual consumers and other governments have no interest in using or allowing backdoored products.