Synced Hash-Based Signatures: Post-Quantum Authentication in a Blockchain

Santi J.  Vives

Paper 2020/1055

Synced Hash-Based Signatures: Post-Quantum Authentication in a Blockchain

Santi J. Vives

Abstract

A new post-quantum, hash-based signature (HBS) scheme is introduced. In known HBS, the size and cost of each signature increase as the total number of messages one wishes to authenticate increase. In real-world applications, requiring large volumes of signatures, they can become impractical. This paper studies HBS in a blockchain: a public, decentralized database. The proposed HBS scheme shows that, when all signatures are known, quite the opposite is possible: the signatures can become more efficient as the number of signatures grows. Authenticating large volumes of messages results less costly on average than authenticating only a few.

Note: This work is part of the Conference with Proceedings "IX Congreso Iberoamericano de Seguridad Informática", University of Buenos Aires, 2017.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. Minor revision. "IX Congreso Iberoamericano de Seguridad Informática", University of Buenos Aires, 2017.
Keywords: hash-besed signatures stateful post-quantum cryptography blockchains
Contact author(s): santi x256 @ gmail com
History: 2020-09-01: received
Short URL: https://ia.cr/2020/1055
License: CC BY

BibTeX

@misc{cryptoeprint:2020/1055,
      author = {Santi J.  Vives},
      title = {Synced Hash-Based Signatures: Post-Quantum Authentication in a Blockchain},
      howpublished = {Cryptology ePrint Archive, Paper 2020/1055},
      year = {2020},
      note = {\url{https://eprint.iacr.org/2020/1055}},
      url = {https://eprint.iacr.org/2020/1055}
}