Verification method, terminal device, network device and medium

A verification method, the method being applied to a network device and comprising:

• receiving a to-be-verified data packet sent by a terminal device, wherein the to-be-verified data packet comprises a source Internet protocol (IP) address, a destination IP address, a first check code, a time authentication factor, and a sequence number;
• determining whether the to-be-verified data packet satisfies a preset condition, wherein the preset condition comprises that a difference between a second system timestamp and the time authentication factor in the to-be-verified data packet is less than a maximum network delay, and the sequence number in the to-be-verified data packet is less than a dynamic limit value, greater than or equal to a window minimum value, and different from a marked sequence number, wherein the second system timestamp is a timestamp determined by the network device when receiving the to-be-verified data packet, the window minimum value is a minimum sequence number in a current sequence number window, and the sequence number window is a fixed-length sequence number range for storing the marked sequence number;
• in response to the to-be-verified data packet satisfying the preset condition, generating a second check code based on a terminal key corresponding to the terminal device and at least one of the time authentication factor or the sequence number;
• and
• determining whether the first check code and the second check code are the same to obtain a corresponding verification result.

A terminal device, comprising:

• at least one processor, and
• a storage apparatus configured to store at least one program;
• wherein the at least one program, when executed by the at least one processor, causes the at least one processor to implement the following:
• generating a time authentication factor based on a first terminal timestamp and a time difference, wherein the first terminal timestamp is a local timestamp of the terminal device when generating the time authentication factor, the time difference is a difference between a second terminal timestamp and a first system timestamp, the second terminal timestamp is a local timestamp of the terminal device when receiving the first system timestamp, and the first system timestamp is a timestamp issued by a third-party device or a network device;
• generating a first check code based on an acquired terminal key and at least one of the time authentication factor or a sequence number;
• and
• generating a to-be-verified data packet and sending the to-be-verified data packet to the network device for verification, wherein the to-be-verified data packet comprises a source Internet protocol (IP) address, a destination IP address, the first check code, the time authentication factor, and the sequence number.