Design Of Public-security Synthesis Mobile Police System Based On C/S Structure & Encryption Scheme

The traditional mobile police information system has lots of defects, such as limited capacity, poor information sharing, less relevant business applications of image, slower encryption and decryption speed. In order to solve these problems of the mobile police information system, this thesis designs a kind of public security synthesis mobile police system based on C/S structure on the basis of analyzing the requirements, tasks, characteristics and actual status of the police system informatization. The system uses modern communication to link the information of police security network and mobile data terminals, and makes full use of the background information resources and improves the working efficiency and combat capability of the police officers. The main results in the research are as follows:1. A kind of public security synthesis mobile police system based on C/S structure is developed. This system adopts the three layer C/S structure to achieve data exchange between the frontline policemen and the data centre.2. This thesis designs the coding schemes which based on XML-based to realize the connection among different network platforms .At the same time, the system uses the JPEG compression algorithm to transmit image information in the wireless network.3. The AES encryption scheme based on officers'password is proposed and realized. This scheme achieves encryption transmission of character and image information, and the programmer has compressed image date before transmission, which makes up the disadvantage of some image encryption algorithm that is without compression. The encryption scheme uses AES encryption algorithm as the basis, officer's password as a key, the confidential expanded function will extend police officers'password into AES algorithm keys. The algorithm needs small storage space and low bandwidth, and has the advantages of high speed and convenient key-manage and digital-signature. The algorithm provides security safeguards for police information system.4. The module of the system's software is tested in order to make sure about its correctness and stability. The public-security synthesis mobile police system realizes mobile office and the sharing of background information, reaches the 3A requirements in police Ministry. The police can achieve the relevant information as quickly as possible. Therefore, the design and implementation of this system has high practical value.