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Privacy-friendly Monero transaction signing on a hardware wallet [IFIPSEC 2020]

   Authors: Dusan Klinec and Vashek Matyas

 Primary contact: Dusan Klinec <ph4r05@mail.muni.cz>

 Conference: IFIPSEC 2020

@InProceedings{2020-ifipsec-klinec,
  Author    = {Dusan Klinec and Vashek Matyas},
  Title     = {Privacy-Friendly Monero Transaction Signing on a Hardware Wallet},
  BookTitle = {{ICT} Systems Security and Privacy Protection - 35th {IFIP} {TC} 11
               International Conference, {SEC} 2020, Maribor, Slovenia, September
               21-23, 2020, Proceedings},
  Series    = {{IFIP} Advances in Information and Communication Technology},
  Volume    = {580},
  Pages     = {338--351},
  Publisher = {Springer},
  Year      = {2020},
  DOI       = {10.1007/978-3-030-58201-2\_23}
  Keywords  = {Monero, Bulletproofs, hardware wallets, cryptocurrency, cryptoimplementations}
}

Abstract

Keeping cryptocurrency spending keys safe and being able to use them when signing a transaction is a well-known problem, addressed by hardware wallets. Our work focuses on a transaction signing process for privacy-centric cryptocurrency Monero, in the hardware wallets. We designed, implemented, and analyzed a privacy-preserving transaction signing protocol that runs on a hardware wallet and protects the spending keys. Moreover, we also implemented a privacy-preserving multi-party version of the Bulletproof zero-knowledge prover algorithm, which runs on a hardware wallet with constant memory. We present the protocols and evaluate their performance on a real hardware wallet.