1 / 11

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.

lyn
Télécharger la présentation

Practical Cryptographic Civil GPS Signal Authentication

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related