[Resource Topic] 2012/063: Randomized Partial Checking Revisited

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Title:
Randomized Partial Checking Revisited

Authors: Shahram Khazaei, Douglas Wikström

Abstract:

We study mix-nets with randomized partial checking (RPC) as proposed by Jakobsson, Juels, and Rivest (2002). RPC is a technique to verify the correctness of an execution both for Chaumian and homomorphic mix-nets. The idea is to relax the correctness and privacy requirements to achieve a more efficient mix-net. We identify serious issues in the original description of mix-nets with RPC and show how to exploit these to break both correctness and privacy, both for Chaumian and homomorphic mix-nets. Our attacks are practical and applicable to real world mix-net implementations, e.g., the Civitas and the Scantegrity voting systems.

ePrint: https://eprint.iacr.org/2012/063

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