Active security is mainly concerned with performing one or more security functions when a host in a communication network is subject to an attack. Such security functions include appropriate actions against attackers. To properly afford active security actions a set of software subsystems should be integrated together so that they can automatically detect and appropriately address any vulnerabi...

Active Networks carry SmartPackets which contain both data and user-specified methods to extend the functionality of switches to perform user-specific computation on the encapsulated data. This enables rapid customization of the network and provides a mechanism to adapt the network to a changing environment. In this paper, we describe the implementation of a prototype Active Network which is im...

Our goal is to infer the topology of a network when (i) we can send probes between sources and receivers at the edge of the network and (ii) intermediate nodes can perform simple network coding operations, i.e., additions. Our key intuition is that network coding introduces topology-dependent correlation in the observations at the receivers, which can be exploited to infer the topology. For und...