| 摘要 |
An apparatus 100 for authentication and verification of original document 110 is disclosed. The document contents are scanned and digitized, using a scanner 125. Then the encoded document contents are logically divided into segments containing data of a single type, and for each segment a set of authentication rules is identified. Thus apparatus 100 generates a digital signature of the document, applying a dual key security scheme to the digitized segments contents and to the secret key of the authenticator. Finally, an authentication code is printed on the document, including the digital signature and the encoded segments contents. To verify the authenticity, document 110 is scanned and digitized again and the digital signature is checked using the associated public key. If the check fails the verifier identifies which of the segment(s) has been modified, comparing it with the related encoded segment contents printed on the document to evaluate its validity. <IMAGE> |
