Message Authentication Candidates for the SBAS Dual Frequency Multi-Constellation Standard

Ignacio Fernandez-Hernandez,Todd Walter,Mikael Mabilleau,Luciano Tosato, Andrea Dalla Chiara, Daniele Pozza, Oscar Pozzobon,Alessandra Calabrese,Jason Anderson,Eric Châtre

Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021)ION GNSS+, The International Technical Meeting of the Satellite Division of The Institute of Navigation（2021）

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摘要

The first version of the SBAS Dual Frequency Multi-Constellation (DFMC) standard has been recently finalized. It is foreseen that its extension includes message authentication, to protect avionics from SBAS data spoofing attacks. This paper focuses on the main candidate scheme at the moment, based on the TESLA protocol in the L5-I channel. This paper analyzes which data needs to be used before authentication in order to maintain time to alert. It describes two options, named Authenticate-then-Use and Use-then-Authenticate, and analyzes its prospective performance for EGNOS and WAAS.

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