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  <section id="authentication">
<span id="id1"></span><h1>Authentication<a class="headerlink" href="#authentication" title="Link to this heading"></a></h1>
<section id="app-passwords">
<h2>App passwords<a class="headerlink" href="#app-passwords" title="Link to this heading"></a></h2>
<p>App passwords allow users to authenticate multiple client applications against their Nextcloud account without giving the application the login password. App passwords are mandatory for accounts with <a class="reference internal" href="two_factor-auth.html#two-factor-auth"><span class="std std-ref">two-factor authentication</span></a> enabled.</p>
<p>Some clients support <em>remote wipe</em>, which makes the connected application delete its local data.</p>
<section id="automated-clean-up">
<span id="authentication-app-password-clean-up"></span><h3>Automated clean-up<a class="headerlink" href="#automated-clean-up" title="Link to this heading"></a></h3>
<div class="versionadded">
<p><span class="versionmodified added">New in version 30.</span></p>
</div>
<p>Nextcloud will delete unused passwords. Passwords set for <em>remote wipe</em> are deleted after 60 days of no usage. App passwords of client applications are deleted after 365 days of no usage.</p>
<p>The time spans can be overwritten with configuration:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">php</span> <span class="n">occ</span> <span class="n">config</span><span class="p">:</span><span class="n">system</span><span class="p">:</span><span class="nb">set</span> <span class="n">token_auth_wipe_token_retention</span> <span class="o">--</span><span class="nb">type</span><span class="o">=</span><span class="nb">int</span> <span class="o">--</span><span class="n">value</span> <span class="mi">2592000</span> <span class="c1"># 60*60*24*30 - 30 days</span>
<span class="n">php</span> <span class="n">occ</span> <span class="n">config</span><span class="p">:</span><span class="n">system</span><span class="p">:</span><span class="nb">set</span> <span class="n">token_auth_token_retention</span> <span class="o">--</span><span class="nb">type</span><span class="o">=</span><span class="nb">int</span> <span class="o">--</span><span class="n">value</span> <span class="mi">63072000</span>     <span class="c1"># 60*60*24*365*2 - 2 years</span>
</pre></div>
</div>
<p>Values are set in <strong>seconds</strong>.</p>
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