International Association for Cryptologic Research

International Association
for Cryptologic Research


Security of the Blockchain Against Long Delay Attack

Puwen Wei
Quan Yuan
Yuliang Zheng
DOI: 10.1007/978-3-030-03332-3_10
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Presentation: Slides
Conference: ASIACRYPT 2018
Abstract: The consensus protocol underlying Bitcoin (the blockchain) works remarkably well in practice. However proving its security in a formal setting has been an elusive goal. A recent analytical result by Pass, Seeman and shelat indicates that an idealized blockchain is indeed secure against attacks in an asynchronous network where messages are maliciously delayed by at most $$\varDelta \ll 1/np$$, with n being the number of miners and p the mining hardness. This paper improves upon the result by showing that if appropriate inconsistency tolerance is allowed the blockchain can withstand even more powerful external attacks in the honest miner setting. Specifically we prove that the blockchain is secure against long delay attacks with $$\varDelta \ge 1/np$$ in an asynchronous network.
  title={Security of the Blockchain Against Long Delay Attack},
  booktitle={Advances in Cryptology – ASIACRYPT 2018},
  series={Lecture Notes in Computer Science},
  author={Puwen Wei and Quan Yuan and Yuliang Zheng},