• Publications
  • Influence
The Other Side of the Coin: User Experiences with Bitcoin Security and Privacy
TLDR
We present the first large-scale survey to investigate how users experience the Bitcoin ecosystem in terms of security, privacy and anonymity. Expand
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Blocks and Chains: Introduction to Bitcoin, Cryptocurrencies, and Their Consensus Mechanisms
TLDR
A new field of cryptographic currencies and consensus ledgers, commonly referred to as blockchains, is receiving increasing interest from various different communities. Expand
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Agreement with Satoshi - On the Formalization of Nakamoto Consensus
TLDR
The term Nakamoto consensus is generally used to refer to Bitcoin’s novel consensus mechanism, by which agreement on its underlying transaction ledger is reached. Expand
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Pay-To-Win: Incentive Attacks on Proof-of-Work Cryptocurrencies
TLDR
The feasibility of bribing attacks on cryptocurrencies was first highlighted in 2016, with various new techniques and approaches having since been proposed. Expand
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(Short Paper) A Wild Velvet Fork Appears! Inclusive Blockchain Protocol Changes in Practice
TLDR
The loosely defined terms hard fork and soft fork have established themselves as descriptors of different classes of upgrade mechanisms for the underlying consensus rules of (proof-of-work) blockchains. Expand
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HydRand: Practical Continuous Distributed Randomness
TLDR
A reliable source of randomness is not only an essential building block in various cryptographic, security, and distributed systems protocols, but also plays an integral part in the design of many new blockchain proposals. Expand
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On the security of security extensions for IP-based KNX networks
TLDR
The traditional areas of building automation like heating, ventilation and air conditioning as well as lighting and shading are more and more extended by services requiring a more robust security infrastructure like alarm-and access control systems. Expand
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HydRand: Efficient Continuous Distributed Randomness
TLDR
A reliable source of randomness is not only an essential building block in various cryptographic, security, and distributed systems protocols, but also plays an integral part in the design of many new blockchain proposals. Expand
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Pitchforks in Cryptocurrencies: - Enforcing Rule Changes Through Offensive Forking- and Consensus Techniques (Short Paper)
TLDR
In this paper, we outline that merged mining can be used as an attack method against a PoW cryptocurrency in the context of a hostile protocol fork. Expand
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