The key to addressing the threat from systems intrusions is strong intrusion detection systems. These systems, which are readily available, identify deviations from normal communications. A strong system can resist attacks and is difficult to circumvent. A strong system can even detect the unsuccessful intrusions that often precede successful intrusions. A good defense against systems intrusions is a combination of regular monitoring of network activity, regular reminders to employees of bank security policies and a well-configured firewall.
Firewalls combine hardware and software to block unwanted communications into and out of a network.
Specific countermeasures are the use of passwords for separate electronic transactions, transmission encryption, log-in banners that warn unauthorized users of monitoring, and telephone traps and traces to isolate and identify intrusions. National banks have been advised previously by the OCC that computer crimes must be reported to appropriate law enforcement agencies. This is particularly important in detecting coordinated systematic intrusions that can affect more than one bank. Its mission is to ensure a safe, sound and competitive national banking system that supports the citizens, communities and economy of the United States.