| 摘要 |
A document (1) has the following features on a substrate (6): at least one document number (2); an optical marking (3) with a machine-readable code (7); and a storage field (4) for accommodating a control number (9). The control number (9) is generated from at least one of the document number (2), the code (7) and a first secret key (10) by means of a cryptographic operation when the document is supplied to an authorised person and entered into the storage field (4). The authenticity of a certificate of authenticity produced in this way can be checked with a verifier, using a cryptographic operation and the information stored on the document (1) by means of a second key. |
