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

Ausschnitt aus dem von Let It TEE erzeugten Graphen.
10/10/2023: "Let It TEE" - Publication at DISC'23

At the 37th International Symposium on Distributed Computing (DISC'23), October 9-13, 2023, in L'Aquila, Italy, we presented our work Let It TEE. We showed that the consensus algorithm DAG-Rider can be transformed using Trusted Execution Environments, such as Intel SGX, such that up to 49% of protocol participants can be malicious while progress can still be made.

SACMAT Poster Thumbnail
08/06/2023: „How to Raise a Robot“ – Poster at SACMAT'23

During the 28th ACM Symposium on Access Control Models and Technologies at the Fondazione Bruno Kessler in Trento, Italy, we have presented our poster „How to Raise a Robot - Beyond Access Control Constraints in Assistive Humanoid Robots”. In the poster, we discuss how humanoid assistive robots can be granted both the necessary level of autonomy for their versatile learning and action capabilities, and how the robots can still learn to respect various constraints such as access control and beyond. In addition to the poster and poster abstract, the publication also includes the presentation video.

Verteidigung OliverThomas Griesbaum
05/22/2023: Successful PhD Graduation - Oliver Stengele

Today, our staff member Oliver Stengele successfully defended his dissertation. For his work titled "Decentralizing Software Identity Management", Oliver researched approaches that enable developers to sovereignly establish and manage unique identities for software. Additionally, he implemented a digital time capsule on the Ethereum blockchain and employed it as part of an independent review process. We congratulate our colleague!

An Extend-only Directed Poset under Modification
04/05/2023: Publication “On Extend-Only Directed Posets and Derived Byzantine-Tolerant Replicated Data Types”

We present our new publication “On Extend-Only Directed Posets and Derived Byzantine-Tolerant Replicated Data Types” at this year's Workshop on Principles and Practice of Consistency for Distributed Data. In the paper, we show a new formalization of the decentralized Matrix system using directed partially-ordered sets, which allow a more extensive model than previous approaches based on directed acyclic graphs. The Extended Version on Arxiv is freely available already.