Cryptology ePrint Archive: Report 2021/784

Analysis and Recommendations for MAC and Key Lengths in Delayed Disclosure GNSS Authentication Protocols

Ignacio Fernández-Hernández and Tomer Ashur and Vincent Rijmen

Abstract: Data and signal authentication schemes are being proposed to address Global Navigation Satellite Systems' (GNSS) vulnerability to spoofing. Due to the low power of their signals, the bandwidth available for authentication in GNSS is scarce. Since delayed-disclosure protocols, e.g., TESLA (timed-efficient stream loss-tolerant authentication), are efficient in terms of bandwidth and robust to signal impairments, they have been proposed and implemented by GNSS. The length of message authentication codes (MACs) and cryptographic keys are two crucial aspects of the protocol design as they have an impact on the utilized bandwidth, and therefore on the protocol performance. We analyze both aspects in detail for GNSS-TESLA and present recommendations for efficient yet safe MAC and key lengths. We further complement this analysis by proposing possible authentication success and failure policies and quantify the reduction of the attack surface resulting from employing them. The analysis shows that in some cases it is safe to use MAC and key sizes that are smaller than those proposed in best-practice guidelines. While some of our considerations are general to delayed-disclosure lightweight protocols for data and signal authentication, we particularize them for GNSS-TESLA protocols.

Category / Keywords: implementation / Global Navigation Satellite System (GNSS), GNSS Authentication, GNSS spoofing, timed-efficient stream loss-tolerant authentication (TESLA)

Original Publication (in the same form): IEEE Transactions on Aerospace and Electronic Systems

Date: received 10 Jun 2021

Contact author: t ashur at tue nl

Available format(s): PDF | BibTeX Citation

Version: 20210610:085726 (All versions of this report)

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