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Nonintrusive tracing in the Internet

This paper presents two novel solutions to the notoriously difficult problem of tracking attacks through the Internet that pass through intermediate computers. The methods are rigorously analysed by mathematical proofs and computer simulations. The work was outcome of an international collaboration between Swansea University, University of Alabama and University of Macau, supported by four U.S. National Science Foundation grants. The novel solutions push the state of the art in tracing cyber attacks, a fundamental problem of national security of high interest to many governments, and has gained attention for follow-on grants.