Paper 2014/735

Dealer-Leakage Resilient Verifiable Secret Sharing

Ruxandra F. Olimid

Abstract

Verifiable Secret Sharing (VSS) guarantees that honest parties reconstruct a consistent secret even in the presence of a malicious dealer that distributes invalid shares. We empower the dishonest dealer and consider the case when he subliminally leaks information in valid shares, allowing an adversary to access the secret prior to the reconstruction phase. We define the concept of Dealer-Leakage Resilient Verifiable Secret Sharing (DLR-VSS) as a stronger notion of VSS that achieves security under this settings. We propose an efficient DLR-VSS and prove its properties in the semi-honest adversarial model.

Note: Thanks to IACR Cryptology ePrint Archive editor Tal Rabin for pointing out an error in the previous version of the protocol.

Metadata
Available format(s)
PDF
Publication info
Preprint. MINOR revision.
Keywords
secret sharing
Contact author(s)
ruxandra olimid @ fmi unibuc ro
History
2014-09-20: revised
2014-09-19: received
See all versions
Short URL
https://ia.cr/2014/735
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2014/735,
      author = {Ruxandra F.  Olimid},
      title = {Dealer-Leakage Resilient Verifiable Secret Sharing},
      howpublished = {Cryptology ePrint Archive, Paper 2014/735},
      year = {2014},
      note = {\url{https://eprint.iacr.org/2014/735}},
      url = {https://eprint.iacr.org/2014/735}
}
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