Oscausi-practical private electronic cash from lelantus and mimblewimble

Lasse Herskind, Panagiota Katsikouli*, Nicola Dragoni

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

After challenging the privacy guarantees of Bitcoin, a lot of alternatives have been proposed to en-hance the privacy-properties of Bitcoin. While Zcash (one of such alternatives) significantly improves the privacy of Bitcoin, its two-coin design with a public base-coin permits critical attacks to happen. In this paper we propose Oscausi, an anonymous payment system that supports practical confidential and anonymous transactions without a public basecoin nor a trusted setup. The scheme is inspired by the Lelantus and MimbleWimble schemes, joining the ideas into one system, with a confidential basecoin and privacy through a shielded pool. Our proposal supports non-interactive transaction aggregation across shielded and unshielded transactions. The scheme is built upon well-known cryp-tography, is easily auditable and requires no trusted setup.

Original languageEnglish
JournalJournal of Internet Services and Information Security
Volume10
Issue number2
Pages (from-to)16-34
ISSN2182-2069
DOIs
Publication statusPublished - May 2020

Keywords

  • Anonymity
  • Confidentiality
  • Cryptocurrencies
  • Electronic Cash
  • Privacy
  • Zero-Knowledge

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