Efficient and Secure Use of Cryptography for Watermarked Signal Authentication

Jason Anderson, Sherman Lo, Todd Walter

Peer Reviewed

Abstract:	This work discusses and applies techniques to efficiently and securely use cryptography for signal authentication in civil (open) satellite navigation signals such as Chips-Message Robust Authentication (“Chimera”). By efficient and secure, we mean maintaining a cryptographic security strength requirement with minimum data bandwidth and watermark signal degradation. We exploit many strategies, including using Timed-Efficient Stream Loss-tolerant Authentication (“TESLA”), sectioned parallelized cryptographic secret distribution, and only one constant, independent spreading code watermark degradation. Our design allows multi-cadence (i.e., slow and fast) distribution even with only a single watermark degradation. Our design maintains standard 128-bit security with a single minimum bandwidth channel while allowing for authentication of many GNSS services.
Published in:	Proceedings of the 2022 International Technical Meeting of The Institute of Navigation January 25 - 27, 2022 Hyatt Regency Long Beach Long Beach, California
Pages:	68 - 82
Cite this article:	Anderson, Jason, Lo, Sherman, Walter, Todd, "Efficient and Secure Use of Cryptography for Watermarked Signal Authentication," Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, California, January 2022, pp. 68-82. https://doi.org/10.33012/2022.18228
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