基于数字水印技术的矢量地理空间数据访问控制方法研究

发布时间：2018-04-09 21:44

本文选题：矢量地理空间数据　切入点：访问控制　出处：《南京师范大学》2013年硕士论文

【摘要】：访问控制技术是近年来信息安全领域研究的热点之一,它通过审核用户的操作权限来保证数据的安全,可以在数据安全事件发生之前进行预防和控制。互联网的普及导致矢量地理空间数据的盗版、非法传播及侵权变得越来越猖獗,矢量地理空间数据的安全共享和版权保护问题也日益凸显。访问控制技术的发展为矢量地理空间数据的安全提供了一种崭新的解决方法,然而由于数据存储和处理方式的特殊性,使得传统访问控制方法难以直接应用于矢量地理空间数据,必须根据其自身的特点研究针对矢量地理空间数据的访问控制技术与方法。本文基于传统访问控制方法以及数字水印技术,分析矢量地理空间数据的特性,围绕矢量地理空间数据的访问控制展开了研究与实践,主要包括以下几个方面的工作： (1)阐明矢量地理空间数据的本质特征,阐述了矢量地理空间数据与普通电子文档在数据结构、存储组织、生产应用环境等方面的区别,分析和总结了矢量地理空间数据在访问控制方面的特殊要求。 (2)分析了传统文件标识方法和鲁棒水印技术优势,提出了一种基于鲁棒水印的矢量地理空间数据文件标识模型和方法,在文件标识嵌入前对其增加分组校验码约束,提取时基于校验规则和置信度对提取结果进行恢复。实验结果表明,该方法具有好的隐蔽性与鲁棒性,并能有效抵抗增加要素、删除要素、裁剪、平移等常见的数据攻击,有效地解决了矢量地理空间数据文件标识问题。 (3)根据矢量地理空间数据特征和生产使用环境的特点,分析、总结访问控制的应用需求,阐述了矢量地理空间数据访问控制目标、策略和系统模型。基于Hook技术和鲁棒水印标识,提出了一种矢量地理空间数据访问控制方法,并实现了矢量地理空间数据的有效期控制和使用次数控制,为矢量地理空间数据安全问题的事先预防提供了可靠的技术手段。 (4)基于脆弱水印技术对内容变化的敏感性,提出了一种矢量地理空间数据权限控制方法,将权限控制问题转化为数据内容变化检测与变化度量问题,检测并统计数据文件中含脆弱水印信息的坐标点,根据含水印信息坐标点占总数据点的比例度量数据内容变化,进而依据用户规则判定是否还需要继续控制该数据。解决了矢量地理空间数据访问控制过程中,数据内容再生产时出现的控制权限不明确的问题。
[Abstract]:Access control technology is one of the hot research topics in the field of information security in recent years. It can ensure the security of data by checking the user's operation rights and can prevent and control the data security events before the occurrence of data security events.With the popularity of the Internet, the piracy of vector geospatial data, the illegal dissemination and infringement become more and more rampant, and the security sharing and copyright protection of vector geospatial data become increasingly prominent.It is difficult for traditional access control methods to be directly applied to vector geospatial data, so it is necessary to study the access control techniques and methods for vector geospatial data according to its own characteristics.Based on the traditional access control method and digital watermarking technology, this paper analyzes the characteristics of vector geospatial data, and focuses on the research and practice of vector geospatial data access control, mainly including the following aspects of work:(1) clarifying the essential characteristics of vector geospatial data, and expounding the differences between vector geospatial data and ordinary electronic documents in data structure, storage organization, production and application environment, etc.The special requirements of vector geospatial data in access control are analyzed and summarized.In this paper, the advantages of traditional file identification method and robust watermarking technology are analyzed, and a vector geospatial data file identification model and method based on robust watermarking is proposed, which adds block check code constraints before file identification is embedded.At the time of extraction, the extraction result is restored based on the check rule and confidence degree.The experimental results show that the proposed method has good concealment and robustness, and can effectively resist the common data attacks such as adding elements, deleting elements, clipping and translation, thus effectively solving the problem of vector geospatial data file identification.According to the characteristics of vector geospatial data and the characteristics of production and use environment, this paper analyzes and summarizes the application requirements of access control, and expounds the object, strategy and system model of vector geospatial data access control.Based on Hook technology and robust watermark identification, a vector geospatial data access control method is proposed, and the validity period control and the number of times of use of vector geospatial data are realized.It provides reliable technical means to prevent the security of vector geospatial data in advance.4) based on the sensitivity of fragile watermarking technology to content change, a method of vector geospatial data access control is proposed, which transforms the privilege control problem into the problem of data content change detection and change measurement.This paper detects and statistics the coordinate points with fragile watermark information in the data file, measures the change of the data content according to the proportion of the watermark information coordinate points to the total number of points, and then determines whether or not to continue to control the data according to the user rules.In the process of vector geospatial data access control, the control limit of data content reproduction is not clear.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P208;TP309

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