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A watermark embedding and authentication method that can locate the tampering of pdf electronic invoices

An electronic invoice and watermark embedding technology, which is applied in image data processing, instruments, image data processing, etc., can solve the problems of low security, small watermark capacity, tampering and positioning restrictions, etc.

Inactive Publication Date: 2018-04-27
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of its authentication algorithms use the redundant space in the cross-reference table to embed watermarks. If this method is used to embed information on electronic invoices in PDF format, the watermark capacity will be small and the security will be low, which will bring harm to the subsequent tampering and positioning. limit

Method used

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  • A watermark embedding and authentication method that can locate the tampering of pdf electronic invoices
  • A watermark embedding and authentication method that can locate the tampering of pdf electronic invoices
  • A watermark embedding and authentication method that can locate the tampering of pdf electronic invoices

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Embodiment

[0059] A kind of embodiment of the present invention is: a kind of watermark embedding and authentication method that can locate PDF electronic invoice tampering, comprises the following steps:

[0060] A. Watermark generation based on document reading page

[0061] A1. Page block: Divide the reader page P of the original PDF electronic invoice file into I page blocks P according to the inherent distribution coordinates of the information unit i , namely P={P i |i=1,2,...,I}, i is page block P i , I is the page block P on the entire reader page P i total;

[0062] A2. Analyze the file structure: analyze the PDF file structure on the code page S of the original PDF electronic invoice file, and obtain the file header S indicating the version information of the PDF file H , file body S O , cross-reference table S X and end of file S T Four parts, namely: S={S H ,S O ,S X ,S T};

[0063] Among them, the file body S O by J objects O j (j=1,2,...,J) composition, namely...

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Abstract

A watermark embedding and authentication method capable of locating tampering of PDF electronic invoices, including A generating watermarks based on document reading pages, specifically including reader page segmentation, parsing code page file structures; generating authentication information, and generating watermarks based on the authentication information; B Watermark embedding based on file code; C. Update of cross index table and file tail; D. Generation of watermarked PDF electronic invoice file; Tamper authenticity judgment and tamper positioning and marking. In this method, while ensuring that the watermark is invisible, the file increment is small and controlled within 1%. It has high detection accuracy for tampering, low false detection rate, and can effectively resist tampering such as replacement, addition and deletion.

Description

technical field [0001] The invention relates to a watermark embedding and authentication method capable of locating tampering of PDF electronic invoices, belonging to the field of electronic invoice authentication. Background technique [0002] As early as 2012, my country launched the pilot work of electronic invoices to reduce the waste of paper caused by issuing paper invoices. The "Online Invoice Management Measures" promulgated by the State Administration of Taxation came into effect on April 1, 2013, requiring all invoice-issuing units and individuals to issue online invoices to consumers. When the current online invoice is used as a financial accounting voucher, it is still necessary to print the electronic invoice on "specific paper". That is to say, the units and individuals that issue invoices still need to send the printed paper invoices to consumers by express, resulting in a waste of manpower and material resources. To this end, in June and December 2013, my c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 陈帆张旋和红杰
Owner SOUTHWEST JIAOTONG UNIV
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