Reconstructing hash reversal based proof of work schemes

摘要: Proof of work schemes use client puzzles to manage limited resources on a server and provide resilience denial service attacks. Attacks utilizing GPUs inflate computational capacity, known as resource inflation, are novel powerful threat that dramatically increase the disparity between clients. This renders proof based hash reversal ineffective potentially destructive. paper examines various such in view GPU-based attacks identifies characteristics allow defense mechanisms withstand In particular, we demonstrate that, hash-reversal which adapt solely load under attack by GPU adversaries; whereas, behavior effective even