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# Time Stamp Authority

Time Stamp Authorities (TSA) issue digitally signed timestamps (RFC 3161) that are optionally used during signed PDF export.

Adding a trusted timestamp to an electronic signature provides a digital seal of data integrity and a trusted date and time of when the transaction took place. Recipients of documents with a trusted timestamp can verify when the document was digitally or electronically signed, as well as verify that the document was not altered after the date the timestamp vouches for.

​​ដើម្បី​ប្រើ​​បញ្ជា​នេះ...

Choose LibreOffice - Preferences Tools - Options - LibreOffice - Security - TSAs

## List of Time Stamp Authorities

Display the list of existing TSAs.

## Add

Opens the Name dialog to enter a new Time Stamping Authority URL.

## Delete

Deletes the selected entry in the list. Deletion is immediate and does not display a confirmation dialog.

ប្រធានបទ​ទាក់ទង

Digital Signatures

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