The U.S. National Security Agency (NSA) last week released a cybersecurity advisory focusing on the security of operational technology (OT) systems, particularly in terms of connectivity to IT systems.

The NSA’s advisory, titled “Stop Malicious Cyber Activity Against Connected Operational Technology,” is specifically addressed to the Department of Defense, national security system (NSS) and defense industrial base organizations, but the recommendations can be useful to any industrial company.

The advisory shares recommendations for evaluating risks and improving the securing of connections between IT systems — these can often serve as an entry point into industrial networks — and OT systems.

Read more: Security Week