METHOD OF GENERATING A PRINTED SIGNATURE IN ORDER TO SECURE THE CONTENTS OF TEXT DOCUMENTS

摘要

The invention relates to a method of generating secure documents. The invention is characterised by the way in which the signatures used to secure the documents are generated. Said signatures are formed from the text content of a printed document without requiring an electronic transcription of the text. The inventive method is based on automatically recognising the form of the words and locating the positions at which the words are repeated, without necessarily knowing the significance of same. In this way, the document can be copied or modified using any means without altering the original message contained in the document. Finally, the method can be used to secure documents printed with normal paper.