GNSS Anti-spoofing Method Research Based On Navigation Message

The application of civil satellite navigation systems in social infrastructure is becoming more and more extensive and deeper,and due to the openness of global satellite navigation system GNSS,no encryption,unauthenticated features,civil navigation signal transmission,and the process of receiving A huge security hole,the most important is the spoofing attack.A spoofing attack refers to a process of tampering or masquerading when a satellite navigation signal is transmitted,thereby misleading the receiver to execute an erroneous instruction,and the target receiver does not know that the received information is erroneous and has strong concealment.This paper is based on the navigation signal system to study the structure and authentication method of the signal authentication system.According to the first level of signal authentication,the asymmetric and symmetrical signal authentication schemes for data message authentication are studied,and a suitable signal authentication system is given.Study and improve the factors that affect the safety and effectiveness of signal authentication.In this paper,the asymmetric signal authentication system based on digital signature DS and the security and effectiveness of symmetric signal authentication system based on MAC are studied and analyzed.Among them,the symmetric signal authentication system has the characteristics of short key length,small overhead and fast running speed,but the symmetry of the key causes the validity and security of the signal authentication to be guaranteed.The key in the asymmetric signal authentication system is complex and has high security,but this solution has high overhead and high running complexity.Therefore,this paper combines the advantages of the two,and gives a mixed-signal authentication system that combines the ECDSA signature authentication of the asymmetric signal authentication system with the TESLA message authentication code authentication of the symmetric signal authentication system,which guarantees the security and satisfies the Navigate the requirements of the message encryption data without incurring additional overhead.According to the structural framework of the asymmetric signal authentication system,the RSA algorithm and the ECDSA in the asymmetric signal authentication system are simulated and analyzed.The simulation results show that the parameter p in the algorithm will affect the running speed of the algorithm,thus affecting the validity of the signal authentication.safety.Compare and analyze the more advantageous ECDSA,improve it,get the simulation results and analyze it.The improved algorithm authentication signature time reduction reduces the possibility of spoofing an attacker to crack a key in a shorter authentication time,and enhances the security of signal authentication.