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Joined the Security Group at the Computer Laboratory, University of Cambridge (UK) in 2004 as a PhD student investigating social and economic mechanisms as tools for strengthening network security. Research interests include security economics, decentralised network (e.g., peer-to-peer and sensor network) security, and complex network analysis. Prior to joining Cambridge, he studied at the University of Tulsa (USA), identifying several vulnerabilities in the public telephone network's underlying signalling protocols and developing techniques for detecting attacks on the telecommunications infrastructure. He is a 2004 Marshall Scholar and NSF Graduate Research Fellow.