Paper 2020/1149

Deterministic Wallets in a Quantum World

Nabil Alkeilani Alkadri, Poulami Das, Andreas Erwig, Sebastian Faust, Juliane Krämer, Siavash Riahi, and Patrick Struck

Abstract

Most blockchain solutions are susceptible to quantum attackers as they rely on cryptography that is known to be insecure in the presence of quantum adversaries. In this work we advance the study of quantum-resistant blockchain solutions by giving a quantum-resistant construction of a deterministic wallet scheme. Deterministic wallets are frequently used in practice in order to secure funds by storing the sensitive secret key on a so-called cold wallet that is not connected to the Internet. Recently, Das et al. (CCS'19) developed a formal model for the security analysis of deterministic wallets and proposed a generic construction from certain types of signature schemes that exhibit key rerandomization properties. We revisit the proposed classical construction in the presence of quantum adversaries and obtain the following results. First, we give a generic wallet construction with security in the quantum random oracle model (QROM) if the underlying signature scheme is secure in the QROM. We next design the first post-quantum secure signature scheme with rerandomizable public keys by giving a construction from generic lattice-based Fiat-Shamir signature schemes. Finally, we show and evaluate the practicality by analyzing an instantiation of the wallet scheme based on the signature scheme qTESLA (ACNS'20).

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Published elsewhere. MINOR revision.ACM CCS 2020
Keywords
blockchain protocolsdeterministic walletspost-quantumrerandomizable signaturesprovable securitylattice-based cryptography
Contact author(s)
nabil alkadri @ tu-darmstadt de
poulami das @ tu-darmstadt de
andreas erwig @ tu-darmstadt de
siavash riahi @ tu-darmstadt de
patrick @ qpc tu-darmstadt de
History
2020-09-25: received
Short URL
https://ia.cr/2020/1149
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2020/1149,
      author = {Nabil Alkeilani Alkadri and Poulami Das and Andreas Erwig and Sebastian Faust and Juliane Krämer and Siavash Riahi and Patrick Struck},
      title = {Deterministic Wallets in a Quantum World},
      howpublished = {Cryptology ePrint Archive, Paper 2020/1149},
      year = {2020},
      note = {\url{https://eprint.iacr.org/2020/1149}},
      url = {https://eprint.iacr.org/2020/1149}
}
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