Strongboxes are computer devices that act as a gateway to connecting to a secure system or network with embedded hardware-level security, and are generally the gold standard for data protection while still allowing global network access.
Features vary by model, but can include:
A lack of wireless transmitter, requiring wired connections.
Built-in shielded connector wires.
Automatic encryption rotation.
Encrypted DSU storage.
Proxy connections to one or more pre-arranged secure network(s).
Automatic deletion of local files, encryption keys, and revocation of secure network access based on some criteria, including:
Remote administrator kill-switch
The device leaving an 'electronic fence'/location zone.
A dead-man switch with a paired cybernetic network.