Enhancing Distributed Systems With Mechanisms to Cope With Malicious Clients

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Executive Summary

In this paper, the authors identify a major security vulnerability in distributed systems: compromised clients under adversarial control can use the system within their authorized access rights and authenticated channels to deliberately insert incorrect data. A significant problem is that when a malicious client insider is discovered, it is hard to quickly assess the scope of the damage, and identify corrupt and suspected updates. They propose Accountability Graph, a mechanism that can assist applications in coping and recovering from such attacks.

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