@misc{KarnapkeSeidelHeuerHoeckneretal., author = {Karnapke, Reinhardt and Seidel Heuer, Dilmari and Hoeckner, Soeren and Walther, Karsten}, title = {Secure connections in local networks despite multiple stakeholders}, series = {Proceedings of Ninth International Congress on Information and Communication Technology : ICICT 2024, London, Volume 4}, journal = {Proceedings of Ninth International Congress on Information and Communication Technology : ICICT 2024, London, Volume 4}, editor = {Yang, Xin-She and Sherratt, Simon and Dey, Nilanjan and Joshi, Amit}, publisher = {Springer-Verlag}, isbn = {978-9819735617}, pages = {141 -- 153}, abstract = {Computer usage authentication mostly comes in two flavors: Either as a key-value pair (name and password) or as certificates from a thrusted authority. Both approaches have their advantages and drawbacks when used for authentication of users on their computer and their computers on the Internet. However, in Industrial Internet of Things environments, when authenticating machines against machines that do not have a permanent Internet connection, this becomes an even bigger issue. In this paper we describe the insufficiencies of these classic approaches when dealing with attacks that originate inside a local network and present our methods of mutual authentication for devices in environments where multiple stakeholders are involved and a permanent Internet connection is not a given.}, language = {en} } @misc{ChatharajupalliRottaKarnapkeetal., author = {Chatharajupalli, Navya Sneha and Rotta, Randolf and Karnapke, Reinhardt and Nolte, J{\"o}rg}, title = {Probing considered harmful : leveraging RSSI for link quality prediction}, series = {Proceedings of the IEEE 50th Conference on Local Computer Networks : LCN 2025 : October 14-16, 2025, Sydney, Australia}, journal = {Proceedings of the IEEE 50th Conference on Local Computer Networks : LCN 2025 : October 14-16, 2025, Sydney, Australia}, publisher = {IEEE}, address = {New York, NY}, isbn = {979-8-3315-3704-3}, issn = {2831-7742}, doi = {10.1109/LCN65610.2025.11146347}, pages = {1 -- 9}, abstract = {Wireless mesh protocols that use a routing metric based on throughput or airtime require predictions about future throughput for all mesh neighbors. Typically, the Wi-Fi rate controller provides this information, and state-of-the-art rate control algorithms estimate it based on statistics from past unicast transmissions. This introduces an adverse cross-layer dependency because meaningful statistics are only available for the links that were used by the routing layer. Existing implementations either ignore this, or use other routing metrics, such as distance, or generate artificial periodic probe traffic to all neighbors. Unfortunately, probing reacts slowly to changing conditions, increases the medium contention, and can lead to overly optimistic predictions. To overcome this, we introduce an RSSI-based link quality prediction for the routing layer. Benchmarks in a B.A.T.M.A.N. version V mesh show a decrease of round-trip time by three orders of magnitude and an increase of the end-to-end packet delivery ratio. TCP connections became possible over long routes that were previously unusable. Although highly imprecise, the easy to acquire RSSI provided sufficiently good predictions for our mesh network.}, language = {en} } @misc{ChatharajupalliRottaKarnapkeetal., author = {Chatharajupalli, Navya Sneha and Rotta, Randolf and Karnapke, Reinhardt and Nolte, J{\"o}rg}, title = {Animal health monitoring and tracking through solar-powered mesh network}, series = {22. GI/ITG KuVS Fachgespr{\"a}ch Sensornetze : 11. und 12. September 2025, Clausthal-Zellerfeld}, journal = {22. GI/ITG KuVS Fachgespr{\"a}ch Sensornetze : 11. und 12. September 2025, Clausthal-Zellerfeld}, publisher = {TU Clausthal-Zellerfeld}, address = {Clausthal-Zellerfeld}, doi = {10.21268/20250805-0}, pages = {1 -- 3}, abstract = {Various health and movement sensors, especially bolus sensors inside a cow's stomach, are crucial for timely medical interventions. Commonly, wall-powered gateways are used to retrieve sensor updates and forward them quickly to an analysis service. In large outdoor farmlands, however, localisation of individual cows becomes important while the long-term operation of wall-powered gateways is costly. Previous solutions that use a LoRaWAN gateway with bigger antennas are still limited to 500m and provide only poor localization information. Existing solutions based on a mesh network of repeaters provide good localization but still depend on external wall power. Solar-powered mesh nodes would simplify the long-term operation. In order to achieve this, a significant improvement of the energy efficiency of the mesh nodes is necessary. This paper explores protocol design choices for the energy-efficient communication between mesh nodes and the bolus sensors. By introducing synchronised sleep and communication intervals, the size of the solar panels and energy storage can be reduced.}, language = {en} }