Secure and Dynamic Publish/Subscribe: LCMsec

Research output: Contribution to book/conference proceedings/anthology/reportConference contributionContributedpeer-review



We propose LCMsec, a brokerless, decentralised Publish/Subscribe protocol. It aims to provide low-latency and high-throughput message-passing for IoT and automotive applications while providing much-needed security functionalities to combat emerging cyber-attacks in that domain. LCMsec is an extension for the Lightweight Communications and Marshalling (LCM) protocol. We extend this protocol by providing not only authenticated encryption of the messages in transit, but also a group discovery protocol inspired by the Raft consensus protocol. The Dutta-Barua group key agreement is used to agree upon a shared symmetric key among subscribers and publishers on a topic. By using a shared group key, we reduce the key agreement overhead and the number of message authentication codes (MACs) per message compared to existing proposals for secure brokerless Publish/Subscribe protocols, which establish a symmetric key between each publisher and subscriber and append multiple MACs to each message.


Original languageEnglish
Title of host publication2023 IEEE 98th Vehicular Technology Conference, VTC 2023-Fall - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (electronic)9798350329285
Publication statusPublished - 2023

Publication series

SeriesIEEE Conference on Vehicular Technology (VTC)


Title98th IEEE Vehicular Technology Conference
Abbreviated titleVTC 2023-Fall
Conference number98
Duration10 - 13 October 2023
LocationSheraton Hong Kong Tung Chung hotel
CityHong Kong

External IDs

ORCID /0000-0002-0466-562X/work/159607941



  • cryptography, cybersecurity, IoT security, multicast, Publish/Subscribe security, secure group communication