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SUMMARY:&quot\;Please Verify&quot\;: How Human Behavior Undermines Blockch
 ain Security - Taro Tsuchiya\, Carnegie Mellon University
DTSTART:20250715T130000Z
DTEND:20250715T140000Z
UID:TALK234238@talks.cam.ac.uk
CONTACT:Alexandre Pauwels
DESCRIPTION:Humans are a critical link to the security of any complex syst
 em\, and blockchains are no exception. Sometimes\, even basic assumptions 
 are not met in practice\; we observed that some service providers or users
  do not properly check transactions\, whether purposefully (for latency be
 nefits) or inadvertently (due to operational mistakes). These unexpected b
 ehaviors pose new challenges to blockchain security. The first part of thi
 s talk will examine a network layer vulnerability - a “blockchain amplif
 ication attack.” Some Ethereum nodes appear to sidestep transaction vali
 dations to achieve lower latency\, making them vulnerable to a flood of in
 valid transactions. We quantify its attack damage through mathematical mod
 eling\, network monitoring\, and local simulation\, and compare it with th
 e potential economic gains of latency reduction. The second part focuses o
 n a wallet-level attack - “blockchain address poisoning.” Attackers ge
 nerate addresses resembling the victim’s recipient’s address to fool t
 he victim into sending their assets to the attacker by mistake. We develop
  a detection algorithm to scan two years of Ethereum and Binance Smart Cha
 in (BSC)\, characterize attack patterns\, extrapolate large attack groups\
 , and bound the attacker’s computational capability through measurement 
 and simulation. We will also discuss our initiatives to make our research 
 accessible to end users.\n\nZoom link:\nhttps://us02web.zoom.us/j/85980496
 815?pwd=z3tmHabXUSHbPgCe6VrSDq3WoIOi0R.1
LOCATION:Webinar &amp\; LT2\, Computer Laboratory\, William Gates Building
 .
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