Security verification method and device, electronic equipment, system, medium and product

The invention relates to the technical field of access control, in particular to a security verification method and device, electronic equipment, a system, a medium and a product. The method comprises the following steps: receiving a first request message sent by a non-local device, obtaining SM3 and SM2 timeliness signatures of a first ciphertext, after the SM3 and SM2 timeliness signatures of the first ciphertext pass verification, performing SM2 asymmetric decryption on the first ciphertext to obtain a first plaintext, verifying the first plaintext, and after the first plaintext passes verification, sending an access party timeliness token to the non-local device. And then, receiving a second request message sent by the non-local device, obtaining SM3 and SM2 timeliness signatures of a second ciphertext in the second request message, after the SM3 and SM2 timeliness signatures of the second ciphertext pass verification, performing SM4 symmetric decryption on the second ciphertext to obtain a second plainte