Steganographic watermarking for documents

Defines digital seals for documents, their scope, application environment and limitations. These seals can be used to insert information into documents, as with watermarking, or to use documents as a communication channel for sending concealed messages, as is the goal of steganography. Users can decide to employ one or another functionality, or a combination of them, depending on their needs or preferences. As a step towards these objectives, a system was developed which constitutes a kit with several sealing options. The system writes either visible or invisible marks in digital documents, following the different methods designed and created in this project. These marks or seals, in turn, can be viewed through a seal recognizer. The implementation is done in RTF (rich text format), which is a commercial, massively accessible format.