Cryptology ePrint Archive: Report 2017/881

Möbius: Trustless Tumbling for Transaction Privacy

Sarah Meiklejohn and Rebekah Mercer

Abstract: Cryptocurrencies allow users to securely transfer money without relying on a trusted intermediary, and the transparency of their underlying ledgers also enables public verifiability. This openness, however, comes at a cost to privacy, as even though the pseudonyms users go by are not linked to their real-world identities, all movement of money among these pseudonyms is traceable. In this paper, we present Moebius, an Ethereum-based tumbler or mixing service. Moebius achieves strong notions of anonymity, as even malicious senders cannot identify which pseudonyms belong to the recipients to whom they sent money, and is able to resist denial-of-service attacks. It also achieves a much lower off-chain communication complexity than all existing tumblers, with senders and recipients needing to send only two initial messages in order to engage in an arbitrary number of transactions.

Category / Keywords: cryptographic protocols / anonymity, cryptocurrencies

Date: received 11 Sep 2017

Contact author: rebekah at cs au dk

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Version: 20170917:155802 (All versions of this report)

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