ACARS data link message compression method based on SM4 encryption and application

The invention relates to the technical field of data compression, and provides an ACARS data link message compression method and application based on SM4 encryption, and the method comprises the steps: S1, generating a message text, and enabling the message data of civil aircraft data link communication to become the message text; s2: SM4 encryption: analyzing uplink and downlink messages of an air-ground data link, encrypting the uplink and downlink messages by using an SM4 algorithm, encrypting and decrypting the data message civilized text by using SM4 key extension, and outputting a result; s3, designing a Brotli compression scheme, and designing different quality grade algorithms based on a Brotli algorithm; according to the method, message communication has a certain security guarantee through an encryption technology, and a design scheme for compressing encrypted data messages is provided in combination with a civil aircraft data link communication scene, so that the excellent performance of the Brotli