15 citations · 22 across the 8 of their papers we have counts for
9 papers
On the Robustness of Gossip Protocols in Modern Blockchains
Wenting Li, Jannik Albrecht, Frederik Armknecht +1
Modern platforms such as Ethereum and Polkadot nowadays execute Byzantine fault-tolerant consensus protocols over large validator committees, often comprising hundreds of nodes. At…
Practical Light Clients for Committee-Based Blockchains
Frederik Armknecht, Ghassan Karame, Malcom Mohamed +1
Light clients are gaining increasing attention in the literature since they obviate the need for users to set up dedicated blockchain full nodes. While the literature features a nu…
Larger-scale Nakamoto-style Blockchains Don't Necessarily Offer Better Security
Jannik Albrecht, Sebastien Andreina, Frederik Armknecht +3
Extensive research on Nakamoto-style consensus protocols has shown that network delays degrade the security of these protocols. Established results indicate that, perhaps surprisin…
Report: State of the Art Solutions for Privacy Preserving Machine Learning in the Medical Context
Jasmin Zalonis, Frederik Armknecht, Björn Grohmann +1
Machine Learning on Big Data gets more and more attention in various fields. Even so privacy-preserving techniques become more important, even necessary due to legal regulations su…
Reverse Fingerprinting
Christian A. Gorke, Frederik Armknecht
Software connected to the Internet is an attractive target for attackers: as soon as a security flaw is known, services may be taken under attack. In contrast, software developers…
SMAUG: Secure Mobile Authentication Using Gestures
Christian A. Gorke, Frederik Armknecht
We present SMAUG (Secure Mobile Authentication Using Gestures), a novel biometric assisted authentication algorithm for mobile devices that is solely based on data collected from m…
General Impossibility of Group Homomorphic Encryption in the Quantum World
Frederik Armknecht, Tommaso Gagliardoni, Stefan Katzenbeisser +1
Group homomorphic encryption represents one of the most important building blocks in modern cryptography. It forms the basis of widely-used, more sophisticated primitives, such as…
Protecting Public OSN Posts from Unintended Access
Frederik Armknecht, Manuel Hauptmann, Stefanie Roos +1
The design of secure and usable access schemes to personal data represent a major challenge of online social networks (OSNs). State of the art requires prior interaction to grant a…
Quantum control without access to the controlling interaction
Dominik Janzing, Frederik Armknecht, Robert Zeier +1
In our model a fixed Hamiltonian acts on the joint Hilbert space of a quantum system and its controller. We show under which conditions measurements, state preparations, and unitar…