Text watermarking method and apparatus for hiding information into text documents
US11469879B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2020 |
| Grant date | Oct 11, 2022 |
| Priority date | — |
| Expiry date | Nov 21, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/608
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.