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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)
We propose a novel mechanism for authentication of queries in a sensor network in case these queries are flooded. In our protocol, the base station appends an authenticator to every query, such that each sensor can verify with certain probability that the query is sent by the base station. Implicit cooperation between sensor nodes during the flooding(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)
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 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 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)
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 first determine security issues in the context of access control in sensor networks especially focusing on the problem of node capture, i.e., the possibility that an attacker can completely take over some(More)
—Clustering techniques create hierarchal network structures, called clusters, on an otherwise flat network. Neighboring devices elect one appropriate device as clusterhead. Due to the dynamic environment, clusterhead selection becomes an important issue. We consider the problem of appropriate clusterhead selection in wireless ad-hoc networks and sensor(More)
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)