METHOD AND SYSTEM FOR MARKING TEXT DOCUMENT IN PATTERN OF EXTRA BLANK FOR AUTHENTICATION

摘要

PROBLEM TO BE SOLVED: To provide a method for merging information required for authenticating a text document to the text itself of the document. SOLUTION: A text 100 to be marked is edited and a text 120 in a standard form suited to a model is provided. Next, while using this text in the standard form and a secret key 130 as entry, the unique combination of positions of inter-word blank character is calculated and an extra blank is inserted thereto so that the document of a marked text 150 can be provided. The received marked text document is authenticated by a receiver who shares the secret key and compares the received text document with the marked text document and when both the documents are strictly coincident, the received text document is accepted as true one however when these documents are not coincident, the document is refused as a false.