How can I implement my e-mail certificate (S/MIME) in iOS and sign/encrypt my e-mails?

Call up the file (.p12) that contains your personal certificate. Click on the "Install" button to call up the import wizard.

Select "Install Now".

Now enter the password that you set when exporting the certificate.

Once the password is accepted, iOS will automatically import the certificate. You should receive a confirmation similar to the screenshot as feedback.

Select "Done" to exit the wizard.

The certificate can now be used for digital signing and/or encryption of your messages.

Go to the "Settings" of iOS and open "Passwords & Accounts".

Select the account for which you want to activate S/MIME and click on "Advanced"

In the advanced settings, scroll to S/MIME and enable the option. This will display the additional items "Sign" and "Encrypt".

• The signature authenticates and confirms the integrity of your email by ensuring that the recipient knows that the email is from you and by notifying them if the email has been changed since it was sent.
• Encryption ensures the privacy of your email by ensuring that only the recipient can decipher and view the email content. To encrypt e-mail messages, you must have the recipient's digital certificate installed on your device, and their certificate must be associated with the corresponding entry in your address book.

Once S/MIME is enabled, you can set the digital signature. Click on "Sign" in the advanced account settings under S/MIME and activate the signature.

Your certificate is automatically selected and marked with a check mark. If you have installed several certificates, you can select your certificate from the list below.

As soon as S/MIME is activated you can set the encryption of your messages. In the advanced account settings under S/MIME click on "Encrypt" and activate the encryption.

Your certificate is automatically selected and marked with a check mark. If you have installed several certificates, you can select your certificate from the list below.