Signature verification method for vehicle cloud communication and file transmission

The invention discloses a signature verification method for vehicle cloud communication and file transmission. The signature verification method comprises the steps: by a cloud end of the Internet of Vehicles, decompressing a compressed data packet A.zip uploaded by a server to obtain a data packet A; performing hash value calculation on the decompressed data packet A, storing the calculated hash value in a TXT file, and performing hash value calculation on the TXT file again to obtain the hash value of the TXT file; encrypting the Hash value of the obtained TXT file to obtain a Hash signature, wherein the Hash signature and a certificate provided by a verification center jointly form a PKCS7 signature; repackaging and compressing the data packet A, the hash value of the TXT file and the PKCS7 signature to form a new encrypted ZIP file; carrying out AES encryption on the new encrypted ZIP file, and transmitting the encrypted ZIP file to a vehicle end through a 4G or 5G network; and determining, by the vehicle