Covert Channels and Anonymous Communication in Ad-hoc Networks

摘要: Title of dissertation: COVERT CHANNELS AND ANONYMOUS COMMUNICATION IN AD HOC NETWORKS Song Li Doctor Philosophy, 2007 Dissertation directed by: Professor Anthony Ephremides Department Electrical and Computer Engineering Ad-hoc wireless networks distinguish themselves from their traditional wired counterparts by three unique characteristics: mobility, lack infrastructure, shared channel. These properties have gained popularity in various military civilian applications, but also introduced challenging problems terms ensuring satisfying network performance security. Ad hoc are a fertile ground for new threats security problems. We start demonstrating how covert attacks can be launched using the ad protocols. In particular, nodes ad-hoc to cooperate with each other order accomplish many networking functions such as routing channel access. observe that information conveyed during cooperation procedure. It is very difficult eliminate or even detect these channels. Simulation results show channels depends on characteristics. Anonymous communication has been considered one possible way fighting threats. fact, anonymity privacy attracted intensive attention important societal issues desirable features. One key components most anonymous protocols trapdoors, which we propose construction scheme based pairing-based cryptographies. More careful analysis shown could conflict secure mechanisms, accountability intrusion detection. solution flexibly trade off against according needs individual applications. The basic idea distribute real identity given user among set pseudonyms only sufficient number lead recovery identity. Users authenticate anonymously under pseudonyms. When times caught misbehaving exceeds threshold, user’s recovered had used. Thus, enforced. As conclusion, jointly investigate incorporate all different mechanisms across multiple protocol layers network.