Secure Remote Access
Letting authorized people reach systems from afar without opening a door for attackers requires strong authentication, encryption, and tight scoping.
A Necessary Risk
Engineers, operators, and vendors need to reach systems remotely for monitoring, support, and maintenance. Every remote-access path is also a path an attacker would love to use, and remote access has been the entry point for many serious breaches. The goal is to make legitimate remote work possible while ensuring the path cannot be abused, which means strong identity, encrypted transport, and access scoped to exactly what the session needs.
Building Blocks
- Multi-factor authentication so a stolen password is not enough
- Encrypted tunnels (VPN, SSH, mutual TLS) protecting the session
- Least-privilege scoping to specific systems and functions
- Session recording and logging for accountability
- Time-bounded, just-in-time access rather than standing accounts
Vendor and Third-Party Access
Third-party maintenance access is a recurring weak point: shared accounts, always-on connections, and broad privileges. The safer pattern grants vendors access only when needed, brokered through a controlled gateway, scoped to their equipment, monitored in real time, and revoked when the work is done.
Zero Trust for Remote Access
Modern remote access applies zero-trust principles: the connection is not trusted because it terminates inside the network, but authenticated and authorized per request, with device health checked and access limited to a single resource rather than the whole network.
Fusion Context
For the Hyperion breeder and burner control networks, remote access is a deliberately narrow, brokered path: no direct route from the internet to a controller, access mediated through the industrial DMZ, strong authentication, and command authority over safety-relevant systems tightly restricted. Where only telemetry needs to leave, a one-way data diode removes the possibility of inbound commands entirely.