The application discloses a private protocol
transmission security management system and method based on a one-way
communication device, and relates to the technical field of
network security. The method comprises the following steps: extracting the communication characteristics of a private protocol and performing normalization
processing, and constructing a private protocol feature
library; deploying a protocol analysis engine on the low-security side of a one-way optical
shutter, performing deep detection on the out-domain
data stream, identifying the private protocol, and extracting the current session protocol characteristics; matching the extracted characteristics with the feature
library, and performing compliance
verification and
content filtering according to a
security policy after successful matching; the verified data is encapsulated into a transmission format allowed to pass through the one-way optical
shutter, and is sent to the high-security side through the one-way optical
shutter; the received data is reorganized, and integrity and consistency
verification is performed on the high-security side, and after the
verification is passed, an audit log is recorded and forwarded to a target
system; the protocol behavior and the
session state are monitored in real time, and a
security alarm is triggered and the transmission is blocked for unknown protocols or abnormal behaviors.