  Current electronic voting systems require an anonymous channel during the
voting phase to prevent coercion. Typically, low-latency anonymization-networks
like Tor are used for this purpose. In this paper we devise a monitoring attack
that allows an attacker to monitor whether participants of an election voted,
despite the use of a low-latency network during the voting phase, thereby
breaking an important part of coercion-freeness. We implement a simulation
carrying out our attack and measure its success rates.
