Packet Security Encapsulation for Network Device Trust Verification

The patent applies preliminary action by pre-establishing a blacklist of abnormal service packets and pre-configuring parsing rules at network devices. When packets arrive, the system first checks against the pre-established blacklist and rules, avoiding the need for time-consuming deep parsing of all packets in real-time. This allows the system to quickly identify and block known malicious packets while maintaining service continuity for legitimate traffic.

The patent applies local quality by differentiating the handling of different packet types at the network device. Instead of uniformly blocking all traffic to a black hole, the system locally identifies and blocks only abnormal service packets that match pre-established criteria, while allowing normal service packets to pass through. This selective approach protects the attacked device from malicious packets while maintaining service continuity for legitimate traffic.

The patent applies segmentation by dividing packet inspection into two stages: first checking against pre-established blacklists and simple rules for quick identification, then performing deep parsing only for packets that require it. This segmented approach allows the system to maintain high inspection accuracy for known malicious packets while quickly processing legitimate traffic, thereby preserving real-time performance.