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Out of curiosity: airplane receives the broadcasted properly signed packets with frame counter included. How does it know if the antenna broadcasting is the off
by krisoft 7y ago
Out of curiosity: airplane receives the broadcasted properly signed packets with frame counter included. How does it know if the antenna broadcasting is the official one or one replaying the official at 2 miles south of the normal glideslope?
- TickleSteve 7y agothis does not solve the original issue of signal strength being faked.... but... Authentication provides this, not encryption. The receivers would need a valid certficate to authenticate the transmission.
- throw0101a 7y ago> * How does it know if the antenna broadcasting is the official one or one replaying the official at 2 miles south of the normal glideslope?* With multipole antennas, one can use MLat to determine where the signal came from: * http://www.multilateration.com/surveillance/multilateration.html http://www.multilateration.com/surveillance/multilateration.... * http://www.navcanada.ca/EN/products-and-services/Pages/on-board-operational-initiatives-mlat.aspx http://www.navcanada.ca/EN/products-and-services/Pages/on-bo... * https://en.wikipedia.org/wiki/Multilateration https://en.wikipedia.org/wiki/Multilateration If the signal was received on the antenna pointing forward, then the signal probably came from where you're headed; if it came from an antenna off to the side, then someone may be spoofing.