Stavrou, AngelosJia, Quan2014-09-182014-09-182014-05https://hdl.handle.net/1920/8910In an increasingly connected world, ensuring availability of the services and applications carried by computer networks is critical. As the most far-reaching computer network, the Internet is home to millions of services that have profound influences on people's lives and work. Additionally, mobile ad hoc networks (MANETs), often used to support critical military and civilian projects, rely on the availability of all participating nodes to fulfill their missions. However, the availability of these networks and services are constantly threatened by denial-of-service (DoS) attacks with growing intensity and sophistication. In this thesis, we study different DoS combating mechanisms to protect services and hosts in the contested Internet and MANET environments.112 pagesenCopyright 2014 Quan JiaComputer scienceCapabilityDenial-of-ServiceInternetMANETMoving Target DefenseDissertation