A method for scrambling and restoring shp line-surface layer data
A line-surface layer and scrambling technology, applied in the field of geographic information security, can solve problems such as unrecoverable graphics, large key space, and complexity
Inactive Publication Date: 2016-05-04
NANJING NORMAL UNIVERSITY
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Among them, the two-dimensional chaotic system is more complex than the one-dimensional chaotic system, and the key space is large. The Henon map is a two-dimensional chaotic map that is widely used. The one-dimensional chaos equation is much more complex and can be applied to the scrambling of two-dimensional vector data. Small changes in parameters will cause the scrambled graphics to be unrecoverable
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[0054] Further details will be given below in conjunction with the accompanying drawings and embodiments.
[0055] In this embodiment, a shp line layer data R is selected, and the entire process of index sequence generation, scrambling and restoration of vector data (the same method can be used for surface layer data) is further described in detail. This embodiment selects the national basic geographic data 1:4 million line layer data (such as image 3 ) as experimental data.
[0056] (1) Scrambling process for line layer data
[0057] Step 11: Read the shp line layer data to be scrambled in R
[0058] a) Obtain the relevant information of shp line layer R: the information of point elements contained in each line element, the total number of line elements lineNum is 1785, the total number of point elements pointNum is 80965, point element coordinate information pX, pY;
[0059] b) According to the formula (1), the value of the index sequence length m and n is determined by ...
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The invention discloses a scrambling and restoring method of shp line-face layer data based on a two-dimensional chaos sequence, and belongs to the field of geographic information safety. The method comprises the following steps of (1) the scrambling process which comprises the steps of reading shp line-face layer basic information, generating an index sequence, preprocessing an shp line-face layer, carrying out overall scrambling and generating the scrambled line-face layer according to layer data structure information before scrambling, and (2) the restoring process which comprises the steps of reading scrambled layer basic information, generating a restoration index sequence, preprocessing a scrambled layer, carrying out overall inverse scrambling and generating the restored line-face layer according to the data structure information of the scrambled layer. The method has the advantages of randomness, reversibility and the like, and effective technical means are provided for the safe transmission, packing and storage of geographic space data.
Description
technical field [0001] The invention belongs to the field of geographic information security, and in particular relates to a method for scrambling and restoring shp line-surface layer data based on a two-dimensional chaotic sequence, which can realize safe transmission and access of vector data in the field of geographic information systems. Background technique [0002] Vector geographic data has the incomparable advantages of traditional paper maps such as high precision, massive volume, easy storage, automatic processing, and lossless scaling, and has a wide range of applications. Tampering, therefore, research on the security of vector geographic data is crucial. The vector geographic data scrambling method for vector graphics features is an important information encryption technology and an effective security enhancement method, which is of great significance for improving the security of network information transmission. [0003] The core of the scrambling algorithm i...
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IPC IPC(8): G06T1/00G06F21/60
Inventor 王海荣李安波周卫
Owner NANJING NORMAL UNIVERSITY