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Users often wish to participate in online groups anonymously, but misbehaving users may abuse this anonymity to disrupt the group's communication. Existing messaging protocols such as DC-nets leave groups vulnerable to denial-of-service and Sybil attacks, Mix-nets are difficult to protect against traffic analysis, and accountable voting protocols are unsuited to general anonymous messaging.
Corrigan-Gibbs et al. (Mon,) studied this question.