Welcome to the resource topic for 2023/1791
Title:
Decentralized Compromise-Tolerant Public Key Management Ecosystem with Threshold Validation
Authors: Jamal Mosakheil, Kan Yang
Abstract:This paper examines the vulnerabilities inherent in prevailing Public Key Infrastructure (PKI) systems reliant on centralized Certificate Authorities (CAs), wherein a compromise of the CA introduces risks to the integrity of public key management. We present PKChain, a decentralized and compromise-tolerant public key management system built on blockchain technology, offering transparent, tamper-resistant, and verifiable services for key operations such as registration, update, query, validation, and revocation.
Our innovative approach involves a novel threshold block validation scheme that combines a novel threshold cryptographic scheme with blockchain consensus. This scheme allows each validator to validate each public key record partially and proactively secures it before inclusion in a block. Additionally, to further validate and verify each block and to facilitate public verification of the public key records, we introduce an aggregate commitment signature scheme. Our contribution extends to the development of a new, efficient, and practical Byzantine Compromise-Tolerant and Verifiable (pBCTV) consensus model, integrating the proposed validation and signature schemes with practical Byzantine Fault Tolerance (pBFT).
Through a comprehensive examination encompassing security analysis, performance evaluation, and a prototype implementation, we substantiate that PKChain is a secure, efficient, and robust solution for public key management.
ePrint: https://eprint.iacr.org/2023/1791
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