Decentralized Systems and Network Services Research Group

Under the term "Decentralized Systems and Network Services" we understand distributed and networked technical systems that span over more than one administrative domain. Hence, their operation depends on more than one party. Our research focuses on:

  • Blockchains, broadcast and consensus algorithms and smart contracts
  • P2P-networks and network monitoring
  • Decentralized messaging at the example of Matrix
  • Identity Management and Access Control Systems
  • Secure and privacy-aware computing in partially trustworthy environments.


News | News Archive

Vortrag von Matthias Grundmann auf FC'22Robert Muth
2022/05/11: Paper on P2P network of Bitcoin at Financial Cryptography and Data Security 2022

The number of peers in the P2P network of Bitcoin is difficult to measure. Together with two students we developed a method to estimate the number of active peers in the network - including reachable and unreachable peers. At the Financial Cryptography and Data Security 2022 we published results of applying this method to data collected through our Bitcoin Monitoring.

2022/05/04: Paper and Poster at IEEE ICBC 2022

We presented a short paper about insights into the Bitcoin P2P network at the IEEE International Conference on Blockchain and Cryptocurrency in May 2022. We show for example that the current connection capacity of a majority of the peers is fully used. Matthias Grundmann also presented a poster in which we show how security properties of payment channel protocols can be verified.

Symbolic imageEuropean Union Agency for Cybersecurity
2022/04/07: CBT 2022

The "6th International Workshop on Cryptocurrencies and Blockchain Technology (CBT 2022)" will be held again in conjunction with the "European Symposium on Research in Computer Security (ESORICS)" in September. Hannes Hartenstein is a member of the program committee. The Call for Papers can be found here.

30.12.2021: Publication "ETHTID: Deployable Threshold Information Disclosure on Ethereum"

At the 3rd IEEE International Conference on Blockchain Computing and Applications (BCCA 2021) in November, Oliver Stengele presented the paper "ETHTID: Deployable Threshold Information Disclosure on Ethereum", which is now available in IEEE Xplore. The paper is the result of a cooperation with the Cryptography and Security Group of Prof. Müller-Quade and was available as a preprint since June. In this work, we show that independently generated statements can be published to a blockchain in a temporally coordinated way through a decentralized mechanism.