NoPKI - a Point-to-Point Trusted Third Party Service Based on Blockchain Consensus Algorithm

Wei Yang Chiu, Weizhi Meng*, Christian D. Jensen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


The increasingly interconnected network results in the change of information flow between users and service providers, hence there is an emerging need for building a secure channel for connections. Currently, Public Key Infrastructure System (shortly PKI), the hierarchical trust relationship system, is the most widely used cornerstone technology to help secure the communication channels. However, PKI recently concerns the users due to various security breaches, i.e., the compromised PKI allows attackers to issue any valid keys to the victim and decrypt any secure connections within the system. In this paper, we design a decentralized PKI system, called NoPKI, by leveraging the blockchain technology. The system has multiple small and trusted groups called the neighborhood, which can be formed dynamically. These neighbors are the players in each neighborhood, and each transaction in the PKI system (including registration, revocation, and validation) requires witnesses of neighbors. In the evaluation, we implement our system and validate that our system ensures not only long-term accessibility but also the certificate security and public audit-ability.

Original languageEnglish
Title of host publicationFrontiers in Cyber Security
EditorsGuangquan Xu, Kaitai Liang, Chunhua Su
Publication date2020
ISBN (Print)9789811597381
Publication statusPublished - 2020
Event3rd International Conference on Frontiers in Cyber Security - Tianjin, China
Duration: 15 Nov 202017 Nov 2020


Conference3rd International Conference on Frontiers in Cyber Security
SeriesCommunications in Computer and Information Science


  • Blockchain
  • Certificate authority
  • Decentralized PKI
  • Neighborhood
  • Network security
  • System trust


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