| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of generating a self-authenticating printed document, and to provide a method of authenticating the printed document. <P>SOLUTION: The back side of the printed document contains 2D barcodes encoding the extracted features of the document contents. The features are hashed into a hash code, converted to a barcode stamp element, and transformed into a hierarchical barcode stamp by repeating the stamp element. The hierarchical barcode stamp is printed as a gray background pattern on the front side of the same sheet of the printed document. To authenticate the printed document, the barcodes on the back side are read to extract the document features. The features are hashed into a hash code for comparison with the hash code extracted from the hierarchical barcode stamp on the front side of the document to decide whether or not the back-side barcodes have been altered. Furthermore, the document features extracted from the front and back sides of the document are compared with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT |
