MAI statistics estimation and analysis in a DS-CDMA system

Hassani, Aicha Alami; Zouak, M.; Mrabti, Mostafa; Abdi, Farid

doi:10.1088/1757-899x/353/1/012026

Cited by 1 publication

(1 citation statement)

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“…where S is the desired content of the decision statistic that is used to determine bit value, and ζ is a random variable, representing both environment noise and multiple access interference (MAI) from other spreading code sequences [55], [56].…”

Section: B Ed On Gnss Signalsmentioning

confidence: 99%

Protecting GNSS Open Service Navigation Message Authentication Against Distance-Decreasing Attacks

Zhang

Larsson

Papadimitratos

2022

IEEE Trans. Aerosp. Electron. Syst.

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As the security of global navigation satellite systems (GNSSs) for civilian usage is increasingly important, navigation message authentication (NMA) significantly improves resilience to spoofing attacks. However, not all attacks can be effectively countered: a strong variant of replay/relay attacks, distance-decreasing (DD) attacks, can shorten pseudorange measurements, without manipulating the cryptographically protected navigation message, thus manipulating the position, velocity, and time solution undetected. First, we discuss how DD attacks can tamper with GNSS signals, demonstrating the attack effectiveness on a recorded Galileo signal. DD attacks might introduce bit errors to the forged signals, but the adversary can keep this error rate very low with proper attack parameter settings. Then, based on our mathematical model of the prompt correlator output of the tracking phase at the victim receiver, we find that the correlator output distribution changes in the presence of DD attacks. This leads us to apply hypothesis testing to detect DD attacks, notably a goodness-of-fit (GoF) test and Manuscript

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Section: B Ed On Gnss Signalsmentioning

confidence: 99%