EINSTEIN is an intrusion detection system (IDS) for monitoring and analyzing Internet traffic as it moves in and out of United States federal government networks. EINSTEIN filters packets at the gateway and reports anomalies to the United States Computer Emergency Readiness Team (US-CERT) at the Department of Homeland Security.
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EINSTEIN is designed to provide the federal government with a cohesive view of Internet threats and a centralized point of authority for dealing with potential threats. The second iteration of EINSTEIN included automatic alerts to US-CERT when activity matching predetermined patterns is detected. According to US-CERT, the patterns, which are called signatures, are not typically included in commercially available databases of known attack signatures, but are developed by US-CERT. EINSTEIN 3 includes supplemental signatures developed by the National Security Agency (NSA) and uses real-time deep packet inspection (DPI). In addition to notifying US-CERT when a network intrustion is attempted, EINSTEIN 3 also alerts government agencies.
As with all intrustion detection systems, EINSTEIN's weakness is that it cannot detect threats that do not have an associated signature in EINSTEIN's database.