This present work presents the most current research from mathematicians and computer scientists from around the world to develop strategies for counterterrorism and homeland security to the broader public. New mathematical and computational techniques concepts are have applied to counterterrorism and computer security problems. Topics covered include: strategies for disrupting terrorist cells, border penetration and security, terrorist cell formation and growth, data analysis of terrorist activity, terrorism deterrence strategies, information security, emergency response and planning. Since 2001, tremendous amounts of information have been gathered regarding terrorist cells and individuals potentially planning future attacks. This book addresses this need to develop new countermeasures. Interested readers include researchers, policy makers, politicians, and the members of intelligence and law enforcement agencies.