Marek Hejmo

Learn More
In mobile ad hoc networks (MANETs), a source node must rely on other nodes to forward its packets on multi-hop routes to the destination. Secure and reliable handling of packets by the intermediate nodes is difficult to ensure in an ad hoc environment. We propose a trust establishment scheme for MANETs which aims to improve the reliability of packet(More)
In a mobile ad hoc network (MANET), a source node must rely on intermediate nodes to forward its packets along multi-hop routes to the destination node. Due to the lack of infrastructure in such networks,secure and reliable packet delivery is diffocult to achieve. We propose a robust cooperative trust establishment scheme to improve the reliability of(More)
In a mobile ad hoc network (MANET), a source node must rely on intermediate nodes to forward its packets along multi-hop routes to the destination node. Due to the lack of infrastructure in such networks, secure and reliable packet delivery is challenging. We propose a robust cooperative trust establishment scheme to improve the reliability of packet(More)
—Quality-of-service (QoS) signaling protocols for mobile ad hoc networks (MANETs) are highly vulnerable to attacks. In particular, a class of denial-of-service (DoS) attacks can severely cripple network performance with relatively little effort expended by the attacker. A distributed QoS signaling protocol that is resistant to a class of DoS attacks on(More)
A class of Denial-of-service (DoS) attacks on quality-of-service (QoS) based signaling protocols for mobile ad hoc networks (MANETs) can severely cripple network performance with relatively little effort expended by the attacker. We propose a new distributed QoS signaling scheme that is resilient to this class of attacks. The key elements of the scheme are:(More)
Supporting quality-of-service (QoS) in a mobile ad hoc network (MANET) is a challenging task, particularly in the presence of malicious users. We present a detailed analysis of attacks directed at disrupting QoS in MANETs. We introduce a new class of attacks targeted at degrading QoS. We consider attacks on both reservation-based and reservation-less QoS(More)
Mobile ad hoc networks are especially susceptible to denial-of-service attacks due to the lack of infrastructure, the imperfections of the wireless channel, and the limitations of the mobile devices. In principle, providing quality-of-service and resistance against flooding attacks can be achieved with per-flow management. However, a per-flow management(More)
In a mobile ad hoc network (MANET), the nodes act both as traffic sources and as relays that forward packets from other nodes along multi-hop routes to the destination. Such networks are suited to situations in which in a wireless infrastructure is unavailable, infeasible, or prohibitively expensive. However, the lack of a secure, trusted infrastructure in(More)