Matthias Schäfer

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This work studies the security of next generation air traffic surveillance technology based on Automatic Dependent Surveillance – Broadcast (ADS-B). ADS-B is already supported by a majority of international aircraft and will become mandatory in 2020 for most airspaces worldwide. While it is known that ADS-B might be susceptible to different spoofing(More)
Automatic Dependent Surveillance-Broadcast (ADS-B) is one of the key components of the next generation air transportation system. Since ADS-B will become mandatory by 2020 for most airspaces, it is important that aspects such as capacity, applications, and security are investigated by an independent research community. However, large-scale real-world data(More)
Onc of the most important challenges of the emerging Information Age is to effectively utilize the immense wealth of data and information acquired, computed and stored by modem information systems. On the one hand , the intelligent use of available data volumes and information extracted thereof offers large potential to realize technological progress and(More)
We propose a new approach for securely verifying sequences of location claims from mobile nodes. The key idea is to exploit the inherent mobility of the nodes in order to constrain the degree of freedom of an attacker when spoofing consecutive location updates along a claimed track. We show that in the absence of noise, our approach is able to securely(More)
In this poster, we generalize the problem of secure location verification to that of path verification and propose a scheme to securely verify the claims of a mobile node that moves along a path. Although the secure verification of location claims has been studied extensively in the literature, current solutions require very strict time synchronization of(More)
Future transportation systems highly rely on the integrity of spatial information provided by their means of transportation such as vehicles and planes. In critical applications (e.g. collision avoidance), tampering with this data can result in life-threatening situations. It is therefore essential for the safety of these systems to securely verify this(More)
BACKGROUND Despite the widespread recognition of the importance of mentoring in medical education, valid and reliable instruments for evaluating the relationship of mentors and protégés are lacking. The aim of this study was to develop a feasible instrument to measure the satisfaction with mentoring relationships. METHODS Based on two existing(More)
This poster presents the idea of exploiting mobility to improve the security in location and track verification. Unlike traditional approaches which require tight time synchronization or two-way communication, mobility can be used to derive lightweight verification schemes. By ensuring independent movement of the verifiers, our scheme can provide security(More)