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Semi-Assisted Signal Authentication based on Galileo ACAS. (arXiv:2204.14026v1 [cs.CR])
May 2, 2022, 1:20 a.m. | Ignacio Fernandez-Hernandez, Simon Cancela, Rafael Terris-Gallego, Gonzalo Seco-Granados, José A. López-Salcedo, C. O'Driscoll, J. Wink
cs.CR updates on arXiv.org arxiv.org
A GNSS signal authentication concept named semi-assisted authentication is
proposed. It is based on the re-encryption and publication of keystream
sequences of some milliseconds from an already existing encrypted signal. Some
seconds after the keystreams are transmitted in the signal-in-space, the signal
broadcasts the key allowing to decrypt the sequences and the a-posteriori
correlation at the receiver. The concept is particularized as Galileo Assisted
Commercial Authentication Service, or ACAS, for Galileo E1-B, with OSNMA used
for the decryption keys, and …
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