5 papers
Blockchain Attacks and Defenses: A Layered and Cross-Domain Survey
Junjie Hu, Na Ruan
Blockchains have evolved from simple distributed ledgers into programmable platforms that process complex application logic and carry significant financial value. All modern Web3 s…
Larger Scale Offers Better Security in the Nakamoto-style Blockchain
Junjie Hu
Traditional security models for Nakamoto-style blockchains assume instantaneous synchronization among malicious nodes, which overestimate adversarial coordination capability. We re…
Timestamp Manipulation: Timestamp-based Nakamoto-style Blockchains are Vulnerable
Junjie Hu, Sisi Duan
Nakamoto consensus are the most widely adopted decentralized consensus mechanism in cryptocurrency systems. Since it was proposed in 2008, many studies have focused on analyzing it…
kFuse: A novel density based agglomerative clustering
Huan Yan, Junjie Hu
Agglomerative clustering has emerged as a vital tool in data analysis due to its intuitive and flexible characteristics. However, existing agglomerative clustering methods often in…
BM-PAW: A Profitable Mining Attack in the PoW-based Blockchain System
Junjie Hu, Na Ruan
Mining attacks enable an adversary to procure a disproportionately large portion of mining rewards by deviating from honest mining practices within the PoW-based blockchain system.…