Revisiting Privacy-aware Blockchain Public Key Infrastructure

Paul Plessing, Olamide Omolola

2020

Abstract

Privacy-aware Blockchain Public Key Infrastructure (PB-PKI) is a recent proposal by Louise Axon (2017) to create a privacy-preserving Public Key Infrastructure on the Blockchain. However, PB-PKI suffers from operational problems. We found that the most important change, i.e., the key update process proposed in PB-PKI for privacy is broken. Other issues include authenticating a user during key update and ensuring proper key revocation. In this paper, we provide solutions to the problems of PB-PKI. We suggest generating fresh keys during key update. Furthermore, we use ring signatures for authenticating the user requesting key updates and use Asynchronous accumulators to handle the deletion of revoked keys. We show that the approach is feasible and implement a proof of concept.

Paper Citation

in Harvard Style

Plessing P. and Omolola O. (2020). Revisiting Privacy-aware Blockchain Public Key Infrastructure. In Proceedings of the 6th International Conference on Information Systems Security and Privacy - Volume 1: ICISSP, ISBN 978-989-758-399-5, pages 415-423. DOI: 10.5220/0008947104150423

in Bibtex Style

@conference{icissp20,
author={Paul Plessing and Olamide Omolola},
title={Revisiting Privacy-aware Blockchain Public Key Infrastructure},
booktitle={Proceedings of the 6th International Conference on Information Systems Security and Privacy - Volume 1: ICISSP,},
year={2020},
pages={415-423},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0008947104150423},
isbn={978-989-758-399-5},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 6th International Conference on Information Systems Security and Privacy - Volume 1: ICISSP,
TI - Revisiting Privacy-aware Blockchain Public Key Infrastructure
SN - 978-989-758-399-5
AU - Plessing P.
AU - Omolola O.
PY - 2020
SP - 415
EP - 423
DO - 10.5220/0008947104150423