IEEE 802.11 networks are particularly vulnerable to DoS (Denial of Service) attacks targeting the network availability. In this paper, we focus on the PS-Poll based DoS attack, where the attacker spoofs the polling frame on behalf of the client in order to discard the client’s buffered packets at the access point level. To cope with this attack, we propose a security solution called APSP (Authe...

Abstract -The IEEE 802.11 MAC protocol supports two modes of operation, a random access mode for non-real-time data applications, and a polling mode for real-time applications. We design and analyze a system that uses the polling mode for interactive voice traffic. With larger inter-poll periods, more voice calls can be accommodated, but at the expense of increased delay. For example, our analy...

During large scale crisis response operations there is an acute and continuous need to efficiently and quickly allocate a dynamically changing supply of resources. In this paper we are proposing a system, which uses polls to seamlessly discover, request, collect and aggregate information from engaged resource providers using the web or mobile devices. At the same time we aim to integrate inform...

The role of the media in the creation of distrust is much debated in political communication. Will negative news, for example, relentless attacks on political authorities, result in political cynicism or in a stimulation effect? By and large the media may stimulate political participation,but it is less clear when negative news will nullify this effect. Negative news may not only have short-ter...