Text Watermarking for Document Forgery Prevention
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Solution Overview
Problem
Existing encryption methods fail to effectively prevent information leakage when confidential documents are decrypted for editing, as editing tools can alter or forge documents, and image capturing devices can capture and print sensitive information, making it difficult to trace unauthorized leaks.
Innovation Solution
A text watermarking method that embeds encrypted blocks with user IDs and random key values into documents using a flip-flop text watermarking algorithm, which alternates binary representation modes and includes error correction codes, to confuse attempts at forgery and ensure the integrity of the embedded information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption algorithms are used to protect confidential information, then confidentiality is protected, but editing tools can still alter or forge decrypted documents
Solution Approach 1:
The patent embeds watermarks into documents before distribution as a preventive measure. This preliminary action ensures that even if documents are decrypted and edited, the embedded watermark provides traceability and detection capabilities, preventing undetected forgery and alteration by malicious users
Solution Approach 2:
The patent implements a feedback mechanism where watermarks are embedded in distributed documents and can be detected later to trace leakage sources. This feedback loop allows the system to identify which user leaked confidential information, creating accountability that deters unauthorized alteration and forgery
2Reliability
If access control is implemented to prevent information leakage, then security is improved, but user convenience and cooperation are reduced
Solution Approach 1:
The patent enables automatic watermark embedding and detection without requiring active user participation in security procedures. The system self-manages the security process by automatically embedding watermarks in distributed documents and providing detection capabilities, eliminating the need for users to manually control access or remember security protocols
Solution Approach 2:
The patent introduces watermarks as an intermediary element that bridges security requirements and user convenience. The watermark serves as a passive security mechanism that operates in the background, providing traceability without interfering with normal document viewing and editing operations
3Loss of information
If image capturing devices are used to document information, then record-keeping is improved, but unauthorized leakage and tracing difficulty increase
Solution Approach 1:
The patent embeds watermarks into documents before distribution as a preventive measure. This preliminary action ensures that even if documents are captured through image devices or other means, the embedded watermark provides traceability to the original source, preventing unauthorized leakage without detection capability
Data Source
AI summary
One aspect of the present invention discloses a text watermarking method for hiding user information. The text watermarking method comprises inputting encryption variable set information with which to encrypt a target document, wherein the target document includes text, generating an encrypted block based on the encryption variable set information and embedding the encrypted block into the target document by using an embedding rule of the encrypted block. The encryption variable set information includes a predetermined random key value, a user ID, and information indicating the embedding rule of the encrypted block. The predetermined random key value and the information indicating an embedding rule of the encrypted block are managed in a non-disclosure manner.