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<?xml version="1.0" encoding="UTF-8"?>
<helpdocument version="1.0">
<!--
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
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<meta>
<topic id="timestampauthoityhelp" indexer="include" status="PUBLISH">
<title id="tit" xml-lang="en-US">Time Stamp Authorities for Digital Signatures</title>
<filename>/text/shared/01/timestampauth.xhp</filename>
</topic>
</meta>
<body>
<bookmark xml-lang="en-US" branch="index" id="bm_id371597437796483">
<bookmark_value>time stamp;digital signature</bookmark_value>
<bookmark_value>digital signature;time stamp</bookmark_value>
<bookmark_value>time stamp authority</bookmark_value>
<bookmark_value>TSA</bookmark_value>
<bookmark_value>time stamp for PDF digital signature</bookmark_value>
</bookmark>
<bookmark xml-lang="en-US" branch="hid/cui/ui/tsaurldialog/TSAURLDialog" id="bm_id251597347799541" localize="false"/>
<section id="timestampauthority">
<bookmark xml-lang="en-US" branch="hid/cui/ui/optsecuritypage/tsas" id="bm_id37269201" localize="false"/>
<h1 id="hd_id901597433114069"><variable id="timestampauthorityh1"><link href="text/shared/01/timestampauth.xhp" name="tsa">Time Stamp Authority</link></variable></h1>
<paragraph id="par_id961597433114070" role="paragraph" xml-lang="en-US">Time Stamp Authorities (TSA) issue digitally signed timestamps (RFC 3161) that are optionally used during signed PDF export.</paragraph>
</section>
<paragraph role="paragraph" id="par_id571597434502189">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.</paragraph>
<section id="howtoget">
<paragraph role="paragraph" id="par_id721597436315261">Choose <switchinline select="sys"><caseinline select="MAC"><menuitem>%PRODUCTNAME - Preferences</menuitem></caseinline><defaultinline><menuitem>Tools - Options</menuitem></defaultinline></switchinline><menuitem> - %PRODUCTNAME - Security - TSAs</menuitem></paragraph>
</section>
<bookmark xml-lang="en-US" branch="hid/cui/ui/tsaurldialog/urls" id="bm_id171597438540975" localize="false"/>
<h2 id="hd_id281597438357127">List of Time Stamp Authorities</h2>
<paragraph role="paragraph" id="par_id701597438367251">Display the list of existing TSAs.</paragraph>
<bookmark xml-lang="en-US" branch="hid/cui/ui/tsaurldialog/add" id="bm_id921597438563568" localize="false"/>
<h2 id="par_idN106871">Add</h2>
<paragraph role="paragraph" id="par_idN1068B1" xml-lang="en-US">Opens the <link href="text/shared/02/namedialog.xhp" name="name dialog">Name dialog</link> to enter a new Time Stamping Authority URL.</paragraph>
<bookmark xml-lang="en-US" branch="hid/cui/ui/tsaurldialog/delete" id="bm_id541597438602560" localize="false"/>
<h2 id="hd_id251597435168013">Delete</h2>
<paragraph role="paragraph" id="par_id381597435161810">Deletes the selected entry in the list. Deletion is immediate and does not display a confirmation dialog.</paragraph>
<section id="relatedtopics">
<embed href="text/shared/01/ref_pdf_export_digital_signature.xhp#pdfexportdigitalsignatureh1"/>
</section>
</body>
</helpdocument>
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