A security system for a computer network that has a plurality of devices connected thereto comprises a security subsystem, a master system and a secure link. The security subsystem is implemented on a first computer and is connected to at least some of the devices in the network. The security subsystem is configured to monitor activities of the at least some devices on the network and detect attacks on the at least some devices. The master system is implemented on a second computer which is different from the first computer. The master system monitors the integrity of the security subsystem and registers information pertaining to attacks detected by the security subsystem. The secure link is connected between the security subsystem and the master system. The master system monitors the integrity of the security subsystem and receives the information pertaining to the attacks through the secure link.