面向共享的矢量地理数据安全关键技术研究

发布时间：2018-05-03 19:46

本文选题：矢量地理数据 + 安全共享　；参考：《南京师范大学》2013年博士论文

【摘要】：矢量地理数据是国家基础设施建设和地球科学研究的支撑性成果之一,在国家经济建设、国防建设、社会生产中有着举足轻重的地位和十分广泛的应用。随着矢量地理数据共享需求的增加,其安全问题也日益凸显,侵权、盗版、泄密、非法传播与使用等行为屡禁不止,业已严重影响和阻碍了矢量地理数据的共享与服务。因此,如何利用技术手段解决矢量地理数据共享与安全之间的矛盾是当前迫切需要解决的问题。本文针对矢量地理数据共享服务面临的安全问题,基于加密技术、数字水印等理论和方法,对面向共享的矢量地理数据安全关键技术进行了深入研究,主要研究成果如下： (1)基于矢量地理数据共享流程,阐述了矢量地理数据共享过程中的特点及安全要求,探讨了精度降低技术、加密技术、数字水印技术等信息安全技术的科学内涵,以及对矢量地理数据共享服务和安全保护的作用。 (2)分析了矢量地理数据精度特征,构建了矢量地理数据精度降低基本规则和数学模型。利用集合映射思想,提出了一种基于加法规则的矢量地理数据精度降低模型。该模型在降低数据精度的同时,较好地保持了矢量地理数据的拓扑关系和几何形状,使数据既能达到安全保密要求又能满足实际应用需求。 (3)利用非线性函数的特性,提出了一种基于乘法规则的矢量地理数据精度降低模型,并从理论上证明了该方法能够保持数据的位置一致性。采用的非线性变换函数具有连续性和递增性,在保持好的数据位置一致性条件下,精度也能够有效控制。 (4)在分析现代加密技术优势的基础上,针对涉密数据的安全保护,提出了一种基于AES加密技术的矢量地理数据局部加密模型。通过拓扑约束规则,保证了矢量地理数据在局部加密、解密过程中的数据可用性,提高了矢量地理数据的安全性。同时,研究了加密技术和水印技术相结合的矢量地理数据安全服务方法。 (5)阐明了矢量地理数据多级分发的应用模式、性能评价和算法设计思想。提出了一种基于双向映射的矢量地理数据两级数字水印模型,有效解决了两次嵌入水印信息相互覆盖的问题,且能保持单级数字水印算法的强鲁棒性。 (6)为了满足更多级的数据分发需求,提出了一种基于水印信息分段的多级水印算法。该算法采用水印信息先分段再合成的水印信息生成模式,有效增加了水印嵌入和数据分发的级数,为矢量地理数据多级分发提供了可行的、安全的技术手段。 (7)针对数据分发次数的变化性和不可预测性,提出了一种基于四叉树动态分块的多级水印算法。该算法可以动态添加水印信息,克服了静态多级水印只能事先确定分发次数的约束,有效提高了多级水印技术的灵活性和适应性。
[Abstract]:Vector geographic data is one of the supporting achievements in national infrastructure construction and earth science research. It plays an important role and is widely used in national economic construction, national defense construction and social production. With the increasing demand for vector geographic data sharing, its security problems have become increasingly prominent, infringement, piracy, leaks, illegal dissemination and use of such acts as repeated prohibitions, has seriously affected and hindered the sharing of vector geographic data and services. Therefore, how to solve the contradiction between vector geographic data sharing and security by technical means is an urgent problem to be solved. Aiming at the security problems faced by vector geographic data sharing service, based on the theory and method of encryption and digital watermarking, this paper makes a deep research on the key technologies of shared vector geographic data security. The main research results are as follows: Based on the flow of vector geographic data sharing, this paper expounds the characteristics and security requirements of vector geographic data sharing, and discusses the scientific connotation of information security technology, such as precision reduction technology, encryption technology, digital watermarking technology, etc. And the role of vector geographic data sharing service and security protection. (2) the accuracy characteristics of vector geographic data are analyzed, and the basic rules and mathematical model for reducing the accuracy of vector geographic data are constructed. Based on the idea of set mapping, a model for reducing the accuracy of vector geographic data based on additive rule is proposed. The model not only reduces the precision of the data, but also maintains the topological relation and geometric shape of the vector geographic data, so that the data can not only meet the requirements of security and confidentiality, but also meet the requirements of practical applications. 3) based on the characteristics of nonlinear function, a reduction model of vector geographic data accuracy based on multiplication rule is proposed, and it is proved theoretically that the method can maintain the consistency of data position. The nonlinear transformation function is continuous and incremental, and the accuracy can be controlled effectively under the condition of keeping good data position consistency. 4) based on the analysis of the advantages of modern encryption technology, a local encryption model of vector geographic data based on AES encryption technology is proposed for the security protection of secret data. The availability of vector geographic data in the process of local encryption and decryption is ensured by topological constraint rules, and the security of vector geographic data is improved. At the same time, the security service method of vector geographic data combining encryption technology and watermark technology is studied. The application mode, performance evaluation and algorithm design of vector geographic data multilevel distribution are expounded. This paper presents a two-level digital watermarking model for vector geographic data based on bidirectional mapping, which effectively solves the problem of twice embedding watermark information covering each other, and can maintain the strong robustness of single-level digital watermarking algorithm. In order to meet the requirement of multi-level data distribution, a multi-level watermarking algorithm based on watermark segmentation is proposed. In this algorithm, the watermark information is generated by subsection and synthesis, which effectively increases the series of watermark embedding and data distribution, and provides a feasible and secure technical means for multi-level distribution of vector geographic data. In view of the variability and unpredictability of data distribution, a multi-level watermarking algorithm based on quadtree dynamic partitioning is proposed. The algorithm can dynamically add watermark information, overcome the constraint that static multilevel watermarking can only determine the distribution times in advance, and effectively improve the flexibility and adaptability of multi-level watermarking technology.
【学位授予单位】：南京师范大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：P208;TP309.2

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