Attacks on cMix Some Small Overlooked Details
Chaum et al. have very recently introduced cMix as the first practical system that offers senders receivers unlinkability at scale. cMix is claimed by its authors to be secure unless all nodes collude (or less than two senders are honest) We argue their assertion does not hold and sustain our statement by three different types of attacks: tagging attack, insider attack and passive attack. For each one, we discuss the settings that make it feasible and possible countermeasures.
IACR Cryptol. ePrint Arch.