| 摘要 |
<p>Systems, methods and computer program products are disclosed for providing long-term authenticity proof of an electronic document having a digital signature, wherein the electronic document is digitally signed with a digital signature and the electronic document and its digital signature are archived in a data archive. Such systems, methods and computer program products according to the invention comprise storing of the electronic document in a first data archive and storing of the hash value of the electronic document in a second data archive which is different from the first data archive. Long-term authenticity and integrity may be achieved by periodically re-signing, particularly time stamping the hash value in the second data archive.
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