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If the data collected within a sensor network is valuable or should be kept confidential then security measures should protect the access to this data. We focus on user authentication, a central problem when trying to build access control mechanisms for sensor networks. We first sketch some security issues in the context of user authen-tication in sensor(More)
Most security protocols for wireless sensor networks (WSN) assume that the adversary can gain full control over a sensor node through direct physical access (node capture attack). But so far the amount of effort an attacker has to undertake in a node capture attack is unknown. In our project we evaluate different physical attacks against sensor node(More)
Wireless sensor networks consist of a large amount of sensor nodes, small low-cost wireless computing devices equipped with different sensors. Sensor networks collect and process environmental data and can be used for habitat monitoring, precision agriculture, wildfire detection, structural health monitoring and many other applications. Securing sensor(More)
We consider the problem of cooperative intrusion detection in wireless sensor networks where the nodes are equipped with local detector modules and have to identify the intruder in a distributed fashion. The detector modules issue suspicions about an intrusion in the sensor's neighborhood. We formally define the problem of intrusion detection and identify(More)
We study the problem of Secure Multi-party Computation (SMC) in a model where individual processes contain a tamper-proof security module, and introduce the TrustedPals framework, an efficient smart card based implementation of SMC for any number of participating entities in such a model. Security modules can be trusted by other processes and can establish(More)
We consider the problem of secure multi-party computation (SMC) in a new model where individual processes contain a tamper-proof security module. Security modules can be trusted by other processes and can establish secure channels between each other. However, their availability is restricted by their host, i.e., a corrupted party can stop the computation of(More)
We propose a novel mechanism for authentication of flooded queries in sensor networks. Each sensor can verify with certain probability that the query is sent by the base station. Implicit cooperation between sensor nodes during the flooding process ensures that the propagation of fake queries is limited to a small part of the network
ABSTR ACT We study a new countermeasure to the well known threat of node capture in sensor networks. A node capture occurs if an adversary completely takes over a sensor node and uses it to spy on the data which is stored and processed within the sensor network. In case this data has some value it needs to be protected from unauthorized access through a(More)