Cryptology ePrint Archive: Report 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.

Category / Keywords: public-key cryptography / hash-besed signatures, stateful, post-quantum cryptography, blockchains

Original Publication (with minor differences): "IX Congreso Iberoamericano de Seguridad Informática", University of Buenos Aires, 2017.

Date: received 31 Aug 2020

Contact author: santi x256 at gmail com

Available format(s): PDF | BibTeX Citation

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

Version: 20200901:082849 (All versions of this report)

Short URL: ia.cr/2020/1055


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