## 3 Design of Maritime Data Security Management Platform
### Information Service Layer  
The information service layer is composed of big data analysis and mining systems and information service systems. It is connected to the bottom database through the data bus and the top user layer through the Web service interface. Among them, the big data analysis and mining system mainly provides computing support for maritime data processing and serves as a unified data acquisition, storage, analysis and output platform, which is the middle part of the connection between the application layer, the data layer and the hardware layer. The big data analysis and mining system can efficiently extract the data required by the upper application, and meet the computing requirements of application batch processing, analysis, visualization and so on. The information service system mainly provides professional maritime information services, including the marine hydrometeorological environment forecast, ship AIS information, electronic navigation chart update, route planning, navigation and other information services. Users can display the required maritime data through the terminal visualization system. Relying on the OSB data bus, the MSP navigation information service system obtains the information data of the registration service from the e-Navigation integrated information management system, then processes and encapsulates the information under the MSP product specifications. The data source and data format are flexibly configured through the data mapping mode. The Java dynamic class loading mechanism is used to maintain the independence of each service, to facilitate the control and management of the service such as loading, publishing and stopping. This system provides the information service of the maritime service set through the service interface, and also provides the ship dynamic information and the maritime security information service to users. Finally, the system configuration management module carries out unified configuration management. Now, ENC (MSP11), maritime safety information (MSPS), meteorological information (MSP15) and hydrological information (MSP15) have been released. The architecture of the MSP navigation information service is shown in Figure 2.  
Figure 2: The architecture of MSP navigation information service. This system obtains service data from the big data storage system and sends it to the processing zoom. It is processed through the navigation information service module, ship dynamic information service module, maritime security information service module and system management module. Finally, it is released through the configured path. The next part describes the workflow of the four service modules. 1. Navigation information service module;  
The navigation information service module is the main function to ensure the safety of ships in navigation, including the electronic navigation chart service, marine environment forecast service, beacon information service and route planning and navigation service. This module provides a special electronic navigation chart service interface, and users can access the latest electronic navigation chart database and update it. Based on the electronic navigation chart, the data of ships, ports, hydrology, meteorology and pollution emissions are superimposed in the form of thematic layers. The layers can be selected independently, and multiple charts are loaded at the same time and stitched together seamlessly. This module functions to access the hydrometeorological data from acquisition instruments from a ship and Marine forecasting center by comparing the real-time data and historical data to obtain higher accuracy of forecast data, and when the ship and the cloud communication failure, it can also function through acquisition instruments from a ship and a simple prediction model for small-scale environmental forecasts. Besides, this module provides route planning and navigation services for shipboard and shore-based users by acquiring data of buoy, ports, observation stations, etc. 2.