[Resource Topic] 2024/796: Weak Consistency mode in Key Transparency: OPTIKS

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Weak Consistency mode in Key Transparency: OPTIKS

Authors: Esha Ghosh, Melissa Chase


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.

ePrint: https://eprint.iacr.org/2024/796

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