ECE Seminar Series
Title: Proof of Location: Verifying Physical Space in Virtual Space using GPS Location Signatures
Speaker: Logan Scott
Affiliation: Logan Scott Consulting
Day: Thursday, April 14, 2016
Time: 5:00 pm - 6:00 pm
Location: LSC 324
Abstract: Most discussion on GPS antispoofing has focused on how to keep a GPS receiver from buying into spoofing signals and reporting a false position and/or time. Less discussed is the question of how to prove a first party’s location to second parties. If I tell you I am at such and such coordinate, how can you be assured that this is true? Such proofs are important in air traffic reporting & control, SCADA command authentication, anti spear phishing, and in other security sensitive applications where validating the origin of a command or report is important. In other applications, users may be denied access to sensitive information such as design documents and business plans, military base maps, and intelligence feeds unless they are at an appropriate location. After discussion of the use case, this talk explores how cryptographic GPSsignal-in-space antispoofing methods can be used to create hard-to-forge and ephemeral cryptographic location signatures. Specifically, at the satellite, low duty cycle, time hopped, spread spectrum security code bursts are substituted into the normal code sequence of the modernized signal data channel to create hidden watermark features that are used to establish the signal’s provenance. With the described method, a compromised receiver has no way of generating valid watermarked signals as it does not possess real-time generating keys. The only way a spoofer/forger could gain access to the security codes, a priori, is to listen for them off the air, a daunting task requiring multiple high gain directional antennas. This talk will also examine specific requirements to do this and describe further anti forging techniques.
Bio: Logan Scott has over 35 years of military and civil GPS systems engineering experience. He has been an active advocate for improved civil GPS security through test based GPS receiver certification, crowd-sourced jammer detection and location (J911), and, by adding robust signal authentication features to civil GPS signals. Logan holds 39 US patents.