Autonomous Agents For Intrusion Detection AAFID(tm) is a distributed monitoring and intrusion detection system that employs small stand-alone programs (Agents) to perform monitoring functions in the hosts of a network. AAFID uses a hierarchical structure to collect the information produced by each agent, by each host, and by each set of hosts, to be able to detect suspicious activity. WWW: http://www.cerias.purdue.edu/about/projects/aafid