Line surface type GIS (Geographic Information System) vector data disguising and recovering method based on inclined angle transformation
A technology of vector data and angle, which is applied in the field of camouflage and restoration of line-surface type GIS vector data based on the angle transformation method, and can solve problems such as complex spatial relationships
Inactive Publication Date: 2013-10-09
NANJING NORMAL UNIVERSITY
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Due to its specific data structure, various data organization methods, complex spatial relationships, high precision, and less redundancy, GIS vector data makes the research on information camouflage of GIS vector data special and difficult.
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[0063] Further detailed description will be given below in conjunction with the accompanying drawings and embodiments.
[0064] In this embodiment, typical shp format vector data is selected, and the present invention is further described in detail for the whole process of data reading, camouflage, and restoration. The present embodiment selects the national 1:4 million provincial boundary layer data ( Figure 4 ) as the experimental data, the original random sequence is set to "10011100101001010011".
[0065] (1) Camouflage process:
[0066] Step 11: Set a random sequence "10011100101001010011" in binary format, the length n of which is 20.
[0067] Step 12: Open the provincial boundary vector data file, set the angle rotation value β=40°; read the spatial data of each element in turn, obtain the number m of coordinate points in the element and judge whether the element needs to be camouflaged:
[0068] The number of coordinate points of the first element read is 177, beca...
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The invention discloses a line surface type GIS (Geographic Information System) vector data disguising and recovering method based on inclined angle transformation, and belongs to the field of geographic information safety. The data disguising method comprises the steps as follows: setting a key file at first, then reading data of elements one by one; selecting a dot pair based on a key, and rotating around a left control point adjacent to the dot pair; and processing all the elements, and storing the disguised data. After the data is disguised by the method, coordinate values in element layers are changed, so that coordinate positions are shifted, and the data precision is altered. Therefore, for the GIS vector data with higher data precision and quality requirement, the data quality and the data useful value are remarkably reduced, the normal use of illegally copied or intercepted data is limited, the purpose of certain data protection is fulfilled, and the hidden communication and safety transmission requirements of the GIS vector data are satisfied in a certain degree.
Description
technical field [0001] The invention belongs to the field of geographic information security, and in particular relates to a method for disguising and restoring line-surface type GIS vector data based on an angle transformation method. Background technique [0002] Currently, the two most important branches of information hiding are information camouflage (steganography) and digital watermarking. Although both information camouflage and digital watermarking adopt the mechanism of hiding information in form, they are quite different in many aspects such as purpose of use, object of protection, nature of secret information, communication method, performance requirements, and attack form. Among them, digital watermark is mainly used for copyright authentication, and information camouflage is a means of secret communication, which obtains the security of secret communication by hiding the existence of secret data. Driven by commercial interests, the development of digital water...
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IPC IPC(8): G06F17/30H04L9/00
Inventor 张驰闾国年李安波林冰仙
Owner NANJING NORMAL UNIVERSITY