Personal Certificate for E-Mail – Step 2: Import In Your E-Mail Client

Tutorial for Outlook

Open Outlook to import the certificate.

Click on ‘File’ in the upper left corner. Then click ‘Options’ in the drop down menu.

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In the left column press ‘Security Center’ (from Outlook version 2013 upwards this point is called Trust Center).

On the right click ‘Settings for the Security Center’.

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The window ‘Security Center’ opens.

  • In the left column click ‘E-Mail Security’.
  • On the right (in the section ‘Digital IDs (Certificates)’) click on ‘Import/Export’
  • The window ‘Import/Export digital ID’ opens. Press ‘Browse’ on the upper right. 

The window for opening the certificate file opens. Choose your certificate and press ‘Open’ in the lower right corner.

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You will get back to the window ‘Import/Export digital ID’.

  • Enter the password of the file, which you chose when you exported the certificate.
  • Enter a name for the certificate (e.g. the name of the file)
  • Then click ‘OK’.

A window ‘Import private exchange key’ opens. Click ‘OK’ on the bottom left.

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You will get back to the window ‘Security Center’. In the upper right section ‘Encrypted e-mails’ click on ‘Settings’.

The window ‘Change security settings’ opens.

  • Here, your certificate (University Duisburg-Essen) should be set as ‘signature certificate’ and ‘encryption certificate’.
  • Should this not be the case, please restart your computer and check again.
  • Click ‘OK’ on the bottom right.

You will get back to the window ‘Security Center’.

  • In the section ‘Encrypted e-mail’ activate the option ‘Add digital signature to outgoing messages’.
  • Click ‘OK’ on the bottom right.

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From now on, your e-mails are signed with your certificate.

You can find out, how to recognize a signed or encrypted message here.

Tutorial for Mozilla Thunderbird

Open Thunderbird to import the certificate. At the top menu click on ‘Extras’ and then ‘Settings’.

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The window ‘Thunderbird Settings’ opens.

  • On the upper right click on ‘Advanced’.
  • Click on the tab ‘Certificates’.
  • On the left, click on ‘Certificates’.

The window ‘Certificate Manager’ opens.

  • Click on the tab ‘Your Certificates’.
  • At the bottom click ‘Import’.

The window for importing your certificate file opens.

  • Choose your certificate file and click ‘Open’ on the bottom right.

The window ‘Password Dialogue’ opens.

  • Enter the password that you set when exporting the certificate from your browser.
  • Then click ‘OK’.

A notification informs you, that your certificate has been imported successfully. Close this notification by clicking on ‘OK’. You can close the remaining windows.

The certificate has now been imported to Thunderbird but still has to be implemented.

  • In the main window of Thunderbird click ‘Extras’ in the upper menu and then ‘Account Settings’.

The window ‘Account Settings’ opens.​

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  • Usually your certificate is chosen automatically. Should this not be the case, choose your certificate in the selection menu.
  • Click ‘OK’ on the bottom right.

A notification will open, in which you get asked, if besides for signatures the certificate should also be used for encryption. Answer this question, depending on your preferences, with ‘Yes’ or ‘No’.

You will get back to the window ‘Account Settings’. Click ‘OK’ on the bottom right.

Now open the window to compose a new message.

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In this window on the top menu, you should find the option ‘S/MIME’.

Press the small black triangle on the right of the button.

Now you can choose if your e-mail should be signed and/or encrypted.

You can find out how to recognize a signed or encrypted message here.