A DEM Fragile Watermark Integrity Authentication Method Considering Terrain Features

A fragile watermark and terrain feature technology, applied in the field of geographic information security, can solve the problem that DEM data cannot be directly transplanted

Active Publication Date: 2017-12-08
NANJING JIYIN INFORMATION TECH
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Problems solved by technology

[0007] The purpose of the present invention is to propose a DEM topographical algorithm for DEM data that may be illegally obtained and tampered with in the circulation process, and DEM data cannot be directly transplanted to other data types due to its exclusive characteristics. The characteristic fragile watermark algorithm solves the integrity authentication problem of DEM data

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  • A DEM Fragile Watermark Integrity Authentication Method Considering Terrain Features
  • A DEM Fragile Watermark Integrity Authentication Method Considering Terrain Features
  • A DEM Fragile Watermark Integrity Authentication Method Considering Terrain Features

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[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0044] Select a 1:10,000 grid DEM experimental data with a size of 509×515, a resolution of 5m, and floating-point elevation data ( image 3 ), for the whole process of watermark information generation, embedding and detection, an embodiment of the method of the present invention is given, and the present invention is further described in detail.

[0045] 1. Watermark information generation:

[0046] Step 1: Select the integer part of the DEM data to be embedded in the watermark, use the D8 algorithm to extract the terrain feature points of the data, and obtain the feature area and non-feature area of ​​the data;

[0047] Step 2: Perform MD5 Hash calculation on the extracted data feature area to obtain the watermark sequence to be embedded.

[0048] 2. Watermark information embedding:

[0049] Step 1: Perform binary conversion on the two di...

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Abstract

The invention discloses a DEM fragile watermark integrity authentication method considering topographic features, and the method comprises the processes of generation of fragile watermark information, embedding of the fragile watermark information, and detection of the fragile watermark information. The method is based on a fragile watermark theory, fully considers the topographic features of DEM, and realizes integrity authentication of DEM data. The invention effectively reduces the influence of watermark embedding on DEM carrier data while the integrity of the DEM data is accurately authenticated.

Description

technical field [0001] The invention belongs to the technical field of geographic information security, and in particular relates to a DEM fragile watermark integrity authentication method in consideration of terrain features. Background technique [0002] Digital elevation model (Digital Elevation Model, referred to as DEM) is a digital simulation of terrain surface through limited terrain elevation data. It is the basic data of geoscience analysis and plays a very important role in national economy and national defense construction. In the modernized background of increasingly sophisticated computer technology, digital technology and network technology, DEM data is subject to security threats from different aspects and degrees in the entire circulation process such as storage, use, dissemination, and replication. Therefore, how to effectively protect the copyright of DEM data and verify its integrity has become a realistic problem that needs to be solved urgently. [0003...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/10G06F21/64
CPCG06F21/10G06F21/64
Inventor 朱长青许惠任娜邹秀珍
Owner NANJING JIYIN INFORMATION TECH
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