Message authentication method and system, sending end and receiving end

Abstract

The invention provides a message authentication method and system, a sending end and a receiving end, which are applied to the technical field of satellite navigation. A message sent in each authentication period comprises an authentication MAC value of the current authentication period, a secret key of the previous authentication period and an enhanced message. According to the secret key of theprevious authentication period and the enhanced message, the receiving end calculates a to-be-authenticated MAC value of a previous authentication period, then obtains an authentication MAC value of the previous authentication period cached in the receiving end, and judges the authenticity of the received secret key and the enhanced message in the current authentication period: if the received secret key and the enhanced message are true, determining that a to-be-authenticated MAC value calculated by the secret key and the enhanced message of the previous authentication period is consistent with the authentication MAC value of the last authentication period cached by the receiving end, and if not, determining that the MAC values are inconsistent, so other people can be prevented from maliciously attacking the receiving end, and the situation that other people try to influence the receiving end by using a forged message is avoided.

Description

technical field [0001] The present application relates to the technical field of satellite navigation, and in particular to an electronic document authentication method and system, a sending end, and a receiving end. Background technique [0002] Satellite-Based Augmentation System (SBAS, Satellite-Based Augmentation System) is a wide-area augmentation system that uses geostationary orbit (GEO) satellites as a communication medium to provide users with differential correction numbers and integrity information. The satellite-based augmentation system processes the satellite signals of the ground station, calculates various correction parameters and integrity information, and broadcasts the information to users through geostationary satellites. Its most important function is to provide integrity information to ensure the safety of aviation users. [0003] The goal of the satellite-based augmentation system is to meet the navigation system requirements of civil aviation from t...

AI Technical Summary

Problems solved by technology

The broadcast signal of the SBAS system adopts an open signal format, which poses a risk of spoofing attacks. At the same time, SBAS provides differential and integrity services relying on SBAS navigation messages. The fraudulent mode for SBAS users is to tamper with SBAS messages, which poses a major challenge to the enhanced security of SBAS navigation.

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