基于C/S结构的移动警务系统的研究与实现
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摘要
针对现有公安综合信息查询系统存在信息采集处理滞后、信息共享性差、重复建设严重、统一指挥与协同作战不力等缺点,论文在分析了公安系统信息化建设的需求、任务、特点及建设现状的基础上,利用无线移动平台、互联网平台和公安专网平台设计并实现了方便、高效的公安综合移动警务系统。该系统以公安专网后台应用系统为依托,以现代移动通信技术为手段,充分利用了公安信息系统的现有资源,为违法处理现场提供了强大的数据信息支持,在很大程度上提高了一线民警的警务工作效率及实战能力,为公安移动警务的实现提供了技术保障。论文的主要研究成果如下:
     (1) 设计并实现了一种基于C/S结构公安无线移动警务系统,该系统利用中间件技术,采用三层C/S结构实现与公安数据中心交换数据,并在多普达686PDA实物环境下验证了系统的功能和性能要求。
     (2) 设计了一种适合无线移动警务系统的数据信息传输解决方案。系统采用基于XML的数据交换技术,整合了异构数据,确保数据能够在网络中方便及可靠传输。同时,在系统逻辑结构设计时采用了内外网安全隔离技术,在正常数据交换和传输的情况下,确保公安专网和公共信息网在物理上的完全隔离。
     (3) 提出了一种适用于无线网络通信的混合数据加密算法。数据采用高级加密标准AES加密,密钥以ECC加密,并用ECC实现数字签名。该混合加密算法需求存储空间小、运算速度快、带宽需求低、密钥管理方便。将该算法应用于公安交警无线移动警务系统的安全保障中,既能快速的进行数据加解密,又能很好地解决密钥分配问题,同时也可以很好地完成数字签名功能。
     (4) 讨论了VPN技术和RADIUS技术的组成原理,并采用VPN和RADIUS认证相结合的方法,解决GPRS移动承载网络的安全接入问题。并将该方法应用于公安移动警务系统,解决了公安移动警务系统的安全接入问题。
     该系统使一线干警可以随时随地取得所需要的有效资料,以及向公安数据服务中心传送数据、图片等信息,它是公安综合查询信息系统的无线延伸,实现公安综合信息无线查询、采集和处理等功能,是现代信息技术在公安交通管理工作中的具体运用。
The traditional police information system has lots of defects, such as out-of-date information collection, obsolete information management, poor share, redundant construction, ineffective unified command and coordinated combat, etc. In order to solve these problems of the police information system, this paper designs and realizes a more convenient and efficient police comprehensive mobile system which makes use of the wireless mobile platform, the internet platform and police special network platform on the basis of requirement analyses, tasks, characteristics and actual status. Based on police special network, modern mobile communications technology and police information resources, the system provides a powerful support of data for frontline policemen at the work spot. This system has enhanced the efficiency and fighting abilities of frontline policemen in a significant way, and has also provided technical supports for the implementation of police mobile system. The main results in the research are as follows:
    (1) A kind of wireless mobile police system based on C/S structure is developed. Using middleware technologies, this system adopts the three layer C/S structure to achieve data exchange between the frontline policemen and the data centre. Moreover, the system achieves the system functions and satisfied the performance requirements in the environment of PDA (dopod686).
    (2) A solution of data transmission is designed for data transmission of wireless police mobile system. In this solution, based on the use of XML data exchange technology, the developed system can ensure that data will be conveniently and reliably transmitted in the network. At the same time, security isolation technology of internal and external network is adopted in the design of system logic structure. In the circumstances of normal data exchange and transmission, the system ensures that the police special network and public networks are completely physical isolation.
    (3) In order to apply to wireless network communications, a hybrid data encryption algorithm is proposed. The proposed algorithm employs the Advanced Encryption Standard (AES) to realize data encryption, makes use of ECC encryption to encrypt key, and utilize ECC encryption to implement digital signature. Moreover, the algorithm needs smaller storage space, runs faster, requires lower bandwidth, and manages key more conveniently. Applying the algorithms to the wireless mobile police security system, it can encrypt or decrypt data rapidly, solve the problem of key
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