Vector space data digital fingerprint method based on GD-PBIBD coding

Abstract

The invention discloses a vector space data digital fingerprint method based on GD-PBIBD coding. The method comprises the following steps: constructing a fingerprint code by using GD-PBIBD with limited conditions, scrambling the fingerprint sequence to be embedded by using Logistic mapping; extracting feature points of vector space data through a D-P algorithm, performing DFT on the feature pointsto obtain a phase coefficient and an amplitude coefficient, then applying a QIM method to embed a fingerprint into the amplitude coefficient of a DFT domain, and finally applying inverse DFT to obtain the vector space data containing the fingerprint. The colluder can be tracked according to the Hamming distance between the suspicious data fingerprint and the original data fingerprint. The methodis simple in coding construction, can accommodate more users compared with a BIBD code under the condition that the code length is fixed, and is high in coding efficiency. Robustness to single-user fingerprint attacks and multiple attacks is good, and the problem of data copyright recognition can be solved. Multi-user minimum value and maximum and minimum value attacks can also be resisted, all traitors can be tracked, and a basis is provided for vector space data traitor tracking.

Description

technical field [0001] The invention relates to the technical field of cartography and geographic information systems, and more specifically relates to a GD-PBIBD coded vector spatial data digital fingerprint method. Background technique [0002] Vector spatial data refers to a type of data with spatial coordinates that is related to geography and spatial distribution and reflects various phenomena and changes in the real world. It plays a very important role in national security and national defense modernization. With the rapid development of the geographic information industry, the application of vector spatial data is becoming more and more extensive, but security issues such as illegal copying and malicious tampering of data have emerged frequently. The emergence of digital watermarking technology has solved the copyright mark of digital products, but For illegally disseminated data, its source cannot be traced; when multiple users illegally conspire to falsify data, it...

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Problems solved by technology

However, under certain parameters, the BIBD design does not necessarily exist, and in the case of large parameters, the construction of this scheme has strict restrictions on the parameters, making the construction difficult

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