Delete MIT Personal Certificates for Safari or Chrome on Mac OS X

Warning: If you have used S/MIME for email encryption, you should export certificates in order to retain a backup copy, before deleting them from the browser. [How can I tell if I've used S/MIME for email encryption?].

1. Navigate, in Finder, to Applications > Utilities > Keychain Access.
   Double-click to open Keychain Access.
   
   
   
   
2. Select the login keychain, and then select My Certificates from the list in the lower pane.
   If you do not have a list in the lower pane, with All Items, Certificates, Passwords..., press the button in the bottom left of the Keychain Access window. Your window should look like the image below:
   
   
   
   
3. Highlight all certificates.
   
   
4. Follow the menu path Edit > Delete, or press the delete key on your keyboard.
   Result: A popup windows prompts to confirm deletion of the certificate. Click Delete.
   
   
   
   
5. Select "All Items" from the Category list in the lower left-hand page. Click "Kind" to sort the certificate items by their type
6. Select everything that has the type "identity preference" and Delete them.
   
   
   
   
7. Type "MIT Certification" into the search box in the upper right hand corner.
8. Highlight the MIT Certification Authority certificate and Delete it.
   
   

See Also

• Certificates Landing Page