基于弱水印的地理数据篡改检验方法

Fragile Watermarking Scheme for Checking the Tamper of Geographical Data

为验证地理数据的真实性、完整性,检验地理数据是否被篡改,提出一种基于弱水印的地理数据篡改检验方法.该方法包括水印嵌入算法和水印检测算法,其中水印嵌入算法采用"两次水印"的方式将组水印和元组水印这两种弱水印信息隐藏到地理数据中.水印检测算法分别进行组水印检测和元组水印检测,然后根据两次水印检测结果所呈现的模式来判定地理数据的完整性,对于不完整或被篡改的数据,可对被篡改的数据进行定位,并识别数据篡改的类型.实验结果表明,该方法具有良好的脆弱性,对常见的数据篡改非常敏感.

To check the tamper of geographical data, we propose a fragile watermarking scheme. The fragile watermarking scheme con- sists of two components： watermark embedding algorithm and watermark detection algorithm. In the watermark embedding algorithm, group watermark and tuple watermark are embedded into the geographical data. The watermark detection algorithm consists of group watermark detection and tuple watermark detection. From the result scheme of group and tuple watermark detection, database owners can verify the integrity of geographical data, and localize and characterize any modifications made to tuples. Experimental results show that the method is very fragile, and is very sensitive to the typical tampers such as deletion, insertion and alteration of one or several geographical objects.