Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. 12b. DISTRIBUTION CODE ABSTRACT (Maximum 200 Words)This report describes the application of the computational immunology approach to a distributed object systems. The hypothesis tested was that one could characterize normal behavior of the application itself in terms of inter-object messages, and use that characterization to successfully detect rogue client attacks on the application. The goals of the research were to test and demonstrate the feasibility of intrusion detection at the application level in distributed object systems. In particular, we worked with applications built on the Common Object Resource Broker Architecture (CORBA). The report shows that the computational immunology approach reliably detects attacks on the Domain Name Server that seriously disrupt Internet service.The report analyzes the components required for a definition of "self' that is applicable to computer programs. The report also conducts experiments that show that a straightforward definition of "self" can detect rogue client attacks on CORBA systems. The project resulted in building a prototype system to aid in the analysis of experimental data and helped generate descriptions of normal application behavior. The prototype intrusion detection system for CORBA can be used wit] a broad class of definitions of "self". NUMBER OF PAGES 69
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