GPS Signal Authentication Using a Chameleon Hash Keychain

Global navigational satellite systems provide accurate time synchronization and location services. Satellites transmit navigation messages that can be used by a receiver to compute its location. However, most are not protected easily spoofed. Several attacks have been reported spoofed or replayed GPS signals divert hijack autonomous vehicles, ships drones. Unfortunately, non-cryptographic protection methods use antenna arrays, pseudorange differences multi-receivers detect spoofing tend inaccurate due environmental conditions. This chapter proposes an efficient signal authentication protocol engages dedicated server continuously hash-based message codes of received from satellites using the chameleon hash keychain. The keychain is practically unbounded, which enables receivers authenticate verify concurrently checking codes. A proof-of-concept prototype has developed demonstrate feasibility scheme. Experimental results key in updated every 30 seconds, enabling five subframes secured with different key. makes it difficult for attackers compromise