Abstract
In this paper we introduce the concept of COPnets. A COPnet refers to a network of security systems (agents) that cooperate to form a collaborative defence system. COPnets give answer to the growing complexity and sophistication of attacks, like DDOS and other botnets. In a COPnet each existing security system is attributed with simple additional tasks to communicate with other allied security systems. The response to an attack is as such a collaborative effort. We will illustrate our idea by depicting a firewall COPnet with pseudo code.