tag:gpgtools.tenderapp.com,2011-11-04:/discussions/problems/127530-cant-sign-another-users-keyGPGTools: Discussion 2023-02-09T00:31:08Ztag:gpgtools.tenderapp.com,2011-11-04:Comment/568733722022-11-23T20:25:38Z2022-11-23T20:25:38ZCan’t sign another user’s key<div><p>Hi Dominik,</p>
<p>welcome to the GPGTools support platform. Sorry to hear you are having problems using GPG Suite.</p>
<p>The error message <code>Invalid digest algorithm</code> along the note <code>Third-party key signatures using the SHA1 algorithm are rejected</code> indicates, that the algorithm preferences for your key are outdated or your key is too old to support better algorithms.</p>
<p>To check your algorithm preferences you need to <a href="https://support.gpgtools.org/kb/gpg-keychain-faq/activate-gpg-keychain-expert-settings">enable expert settings</a>. Then select the key and in the menubar <code>Key > Algorithm Preferences…</code>. Make sure to disable the expert settings once you are done.</p>
<p>Feel free to send a screenshot of your algorithm preferences view along with the key details after double-clicking your sec/pub key in GPG Keychain.</p>
<p>All the best,<br>
Steve</p></div>Steve