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Practical Cryptographic Civil GPS Signal Authentication

Practical Cryptographic Civil GPS Signal Authentication. Kyle Wesson, Mark Rothlisberger , and Todd Humphreys Presentation at ION 2011| September 23, 2011. What does it take to authenticate a GNSS Signal?. Code Origin Authentication. Code Timing Authentication.

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Practical Cryptographic Civil GPS Signal Authentication

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  1. Practical Cryptographic Civil GPSSignal Authentication Kyle Wesson, Mark Rothlisberger, and Todd Humphreys Presentation at ION 2011| September 23, 2011

  2. What does it take to authenticate a GNSS Signal? Code Origin Authentication Code Timing Authentication

  3. Specially-Weighted Correlations

  4. Operational Definition of GNSS Signal Authentication • GNSS signal is declared authentic if: • Logical output S has remained low • Logical output H1 has remained low, and • Output PD has remained above an acceptable threshold

  5. What qualities should cryptographic civil GPS signal authentication have? • Effective: they make it difficult for a spoofer to carry off a successful spoofing attack • Practical: they are likely to be implemented and adopted by the GPS community

  6. A strategy that meets these requirements: Navigation Message Authentication (NMA): • Forms by making the navigation message periodically unpredictable • Applies public-key cryptographic digital signature and verification techniques

  7. CNAV Message

  8. Signing the CNAV Message • Delivers ECDSA signature every five minutes per channel • Delivers 476 unpredictable navigation message bits • Offset scheme could lower time-between-authentications

  9. Hypothesis Testing on Security Code

  10. Probability of Detection under Challenging Scenario

  11. Our Recent Work http://radionavlab.ae.utexas.edu/publications

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