Abstract: This paper describes the replay attack against traditional and channel-based Chaumian mixes and puts it into context with other attacks on anonymizing services. It then evaluates different possible approaches to a defense against said attack, concentrating on the question of efficiently recognizing potentially compromised messages within a channel-based cascade of mixes. Finally, an exemplary implementation of a solution is presented for the anonymizing cascade of mixes of the AN.ON project.
Keywords: Replay Attack, Chaumian Mix, Cascade of Mixes, David L. Chaum, Anonymity, Unobservability, Traffic Analysis, AN.ON, JAP
Themes: Network Security
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