Paper 2021/417

History Binding Signature

Shlomi Dolev and Matan Liber

Abstract

Digital signatures are used to verify the authenticity of digital messages, that is, to know with a high level of certainty, that a digital message was created by a known sender and was not altered in any way. This is usually achieved by using asymmetric cryptography, where a secret key is used by the signer, and the corresponding public key is used by those who wish to verify the signed data. In many use-cases, such as blockchain, the history and order of the signed data, thus the signatures themselves, are important. In blockchains specifically, the threat is forks, where one can double-spend its crypto-currency if one succeeds to publish two valid transactions on two different branches of the chain. We introduce a single private/public key pair signature scheme using verifiable random function, that binds a signer to its signature history. The scheme enforces a single ordered signatures' history using a deterministic verifiable chain of signature functions that also reveals the secret key in case of misbehaviors.

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Published elsewhere. MAJOR revision.CSCML 2021
Keywords
digital signaturesverifiable secret sharingverifiable random functions
Contact author(s)
matanli @ post bgu ac il
History
2021-03-30: received
Short URL
https://ia.cr/2021/417
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2021/417,
      author = {Shlomi Dolev and Matan Liber},
      title = {History Binding Signature},
      howpublished = {Cryptology ePrint Archive, Paper 2021/417},
      year = {2021},
      note = {\url{https://eprint.iacr.org/2021/417}},
      url = {https://eprint.iacr.org/2021/417}
}
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