Method and device for tampering authentication of paper documents

Abstract

The invention relates to a method and device for tampering authentication of paper documents. The method comprises the steps of: extracting key sensitive data information from an electronic document and storing; carrying out anti-counterfeiting processing on a seal image in the electronic document; printing and outputting the electronic document and embedding watermark information in the printed and output paper document at the same time; when authenticating the paper document, digitally processing the paper document to obtain digital image content data and carrying out the tampering authentication by utilizing the key sensitive data information and the watermark information; and judging whether the paper document is an original document or not by authenticating the seal image of the paperdocument, wherein the tampering authentication comprises preliminary tampering authentication and deep tampering authentication. Through the method disclosed by the invention, the technical problemsthat the accuracy the low, the speed is low, the tampering position cannot be accurately located, the authentication of the paper documents cannot be accurately carried out and the like in the currentpaper document tampering authentication field are solved.

Description

technical field [0001] The invention belongs to the field of document protection, and relates to a method and device for authenticating paper document tampering. Background technique [0002] With the prosperity and development of financial business, important documents such as paper-based financial business contracts and legal documents (subsequently referred to as paper documents, and corresponding electronic documents as electronic documents) are widely used as contract proofs. But at the same time, with the rapid popularization of digital printing and image reproduction equipment, the authenticity and integrity of important paper documents have also been challenged unprecedentedly. Every year, due to the illegal tampering of paper documents, the cases of financial entities being held accountable and causing huge losses occur from time to time, which has brought bad effects on social organizations and individuals. [0003] Under normal circumstances, the ways that paper ...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method and device for tampering and authenticating paper documents based on text digital watermarking, which uses a robust text watermarking algorithm to embed key document information in each character of each page of paper documents to achieve paper document The purpose of content integrity and authenticity verification is to solve the current technical problems in the field of paper document tampering and verification, such as low accuracy, slow speed, inability to accurately locate the tampered position, and authenticity identification of paper documents.

Images