Paper 2012/288

Fair Exchange of Short Signatures without Trusted Third Party

Philippe Camacho

Abstract

We propose a protocol to exchange Boneh-Boyen short signatures in a fair way, without relying on a trusted third party. Our protocol is quite practical and is the first of the sort to the best of our knowledge. Our construction uses a new non-interactive zero-knowledge (NIZK) argument to prove that a commitment is the encryption of a bit vector. We also design a NIZK argument to prove that a commitment toa bit vector $v=(b_1,b_2,...,b_\secparam)$ is such that $\sum_{i \in [\secparam]}b_i2^{i-1}=\Blinding$ where $\Blinding$ is the discrete logarithm of some public value $D=g^\Blinding$. These arguments may be of independent interest.

Metadata
Available format(s)
PDF
Publication info
Published elsewhere. Unknown where it was published
Keywords
Fair exchangeshort signaturesgradual release of a secret
Contact author(s)
philippe camacho @ gmail com
History
2012-11-18: last of 6 revisions
2012-05-29: received
See all versions
Short URL
https://ia.cr/2012/288
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2012/288,
      author = {Philippe Camacho},
      title = {Fair Exchange of Short Signatures without Trusted Third Party},
      howpublished = {Cryptology {ePrint} Archive, Paper 2012/288},
      year = {2012},
      url = {https://eprint.iacr.org/2012/288}
}
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