Proxy Gateway Pre-Classifier for Anti-Virus Scanning

The patent applies preliminary action by introducing a pre-classifier that performs classification of data packets before they reach the proxy layer. The pre-classifier examines packet attributes (such as file type, size, and content characteristics) and determines in advance which packets require virus scanning and which can be transmitted directly. This preliminary classification action prevents unnecessary packets from occupying proxy layer resources, thereby resolving the contradiction between maintaining security and improving transmission efficiency.

The patent applies the taking out principle by extracting only the necessary data packets from the general data stream for virus scanning. The pre-classifier identifies and extracts packets with characteristics indicating potential virus threats (such as executable files, document types, or packets matching known virus patterns) and directs only these extracted packets to the virus-scanning and caching module. This selective extraction reduces the workload on scanning resources while maintaining comprehensive detection for relevant packets.

The patent applies segmentation by dividing the packet processing flow into two distinct segments: packets requiring virus scanning and packets that can be transmitted directly. The pre-classifier segments the data stream based on packet attributes, routing suspicious packets through the proxy layer for scanning while allowing clean packets to bypass the proxy layer entirely. This segmentation creates a fast track for legitimate traffic, significantly improving transmission speed while maintaining security through targeted scanning of segmented suspicious packets.