| 摘要 |
<p>Device for managing digital documents, comprising a memory (3) for storing a digital document and a date stamp including first signatures established according to a first method and a time value, a signature generator (5) for establishing second signatures according to a second method, a time stamper, a signature verifier (9) for verifying that a document and a date stamp match, and a supervisor (11) for effecting the operation of the signature generator (5) on the document, effecting the operation of the signature verifier (9) on the document and its date stamp, and, in the event of a match, effecting the operation of the time stamper (7) on the second signatures with the time value.</p> |
