Paper 2024/796

Weak Consistency mode in Key Transparency: OPTIKS

Esha Ghosh, Microsoft Research
Melissa Chase, Microsoft Research
Abstract

The need for third-party auditors in privacy-preserving Key Transparency (KT) systems presents a deployment challenge. In this short note, we take a simple privacy-preserving KT system that provides strong security guarantees in the presence of an honest auditor (OPTIKS) and show how to add a auditor-free mode to it. The auditor-free mode offers slightly weaker security. We formalize this security property and prove that our proposed protocol satisfies our security definition.

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Preprint.
Keywords
Key TransparencyClient MonitoringCheckpointingZero Knowledge Set
Contact author(s)
esha ghosh @ microsoft com
melissac @ microsoft com
History
2024-05-24: approved
2024-05-23: received
See all versions
Short URL
https://ia.cr/2024/796
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2024/796,
      author = {Esha Ghosh and Melissa Chase},
      title = {Weak Consistency mode in Key Transparency: {OPTIKS}},
      howpublished = {Cryptology ePrint Archive, Paper 2024/796},
      year = {2024},
      note = {\url{https://eprint.iacr.org/2024/796}},
      url = {https://eprint.iacr.org/2024/796}
}
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