Watermarking embedding and authentication method of positioning PDF electronic invoice falsification

Abstract

Provided is a watermarking embedding and authentication method of positioning PDF electronic invoice falsification, comprising: A, watermarking generation based on a file reading page, concretely including blocking a reader page, parsing a code page file structure, generating authentication information, and generating watermarking in dependence on the authentication information; B, watermarking embedding based on file codes; C, updating of a cross reference and an end-of-file; and D, generation of a PDF electronic invoice file with watermarking, including performing E authentication information reconstruction, authentication information extraction and F falsification authentication on a PDF electronic file to be detected, and F falsification authentication including falsification authenticity determination and falsification positioning and marking. The method can guarantee invisibility of watermarking, and meanwhile control file increment within 1%. The method has the characteristics of high falsification detection accuracy, and low false drop rate, and can effectively resist replacing, adding, deleting, etc.

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...

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

Images