Aljosha Judmayer

Publications33
h-index11
Citations451
Highly Influential Citations38
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Pay-To-Win: Incentive Attacks on Proof-of-Work Cryptocurrencies
TLDR
This paper identifies noand near-fork incentive attacks as a powerful, yet largely overlooked, category and proposes the first trustless out-of-band bribing attack capable of facilitating double-spend collusion across different blockchains that reimburses collaborators in case of failure.
The Other Side of the Coin: User Experiences with Bitcoin Security and Privacy
TLDR
The first large-scale survey to investigate how users experience the Bitcoin ecosystem in terms of security, privacy and anonymity found that many users do not use all security capabilities of their selected Bitcoin management tool and have significant misconceptions on how to remain anonymous and protect their privacy in the Bitcoin network.
HydRand: Efficient Continuous Distributed Randomness
TLDR
This work improves upon previous random beacon approaches with HydRand, a novel distributed protocol based on publicly-verifiable secret sharing (PVSS) to ensure unpredictability, bias-resistance, and public-verifiability of a continuous sequence of random beacon values.
Blockchain: Basics
Blocks and Chains: Introduction to Bitcoin, Cryptocurrencies, and Their Consensus Mechanisms
TLDR
A lot of innovation in this field has repeatedly come from the community itself in the field of cryptographic currencies and consensus ledgers, including the original publication spirit of the Bitcoin paper.
HydRand: Practical Continuous Distributed Randomness
TLDR
HydRand is a novel distributed protocol based on publicly-verifiable secret sharing (PVSS) to ensure unpredictability, bias-resistance, and public-verifiability of a continuous sequence of random beacon values and is the first to present a detailed comparison of recently described schemes and protocols that can be used for implementing random beacons.
(Short Paper) A Wild Velvet Fork Appears! Inclusive Blockchain Protocol Changes in Practice
TLDR
This work exposes examples where velvet forks or similar constructions are already actively employed in Bitcoin and other cryptocurrencies and expands upon the concept of velvet forks by proposing possible applications and discussing potentially arising security implications.
RandRunner: Distributed Randomness from Trapdoor VDFs with Strong Uniqueness
TLDR
This design allows RandRunner to tolerate adversarial or failed leaders while guaranteeing safety and liveness of the protocol despite possible periods of asynchrony, and avoids the necessity of a BFT consensus protocol and its accompanying high complexity and communication overhead.
ETHDKG: Distributed Key Generation with Ethereum Smart Contracts
Agreement with Satoshi - On the Formalization of Nakamoto Consensus
TLDR
How Bitcoin’s consensus mechanism sets itself apart from previous approaches and where it can provide new impulses and directions to the scientific community is outlined, as well as a contextualization in respect to previous research on the agreement problem and fault tolerant distributed computing.
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