S/MIME – Secure Email Communication with Certificates
S/MIME (Secure/Multipurpose Internet Mail Extensions) is a proven standard for encrypting and signing emails.
Functions of S/MIME
S/MIME offers two main functions that can be used for both incoming and outgoing messages:
- Encryption:
- Protects the content of your emails from unauthorized access. Only the intended recipient can decrypt the message.
- Ideal for confidential information such as contracts, financial data, or personal data.
- Signature:
- Ensures that the message is authentic and has not been altered.
- Allows the recipient to verify the identity of the sender.
Step-by-Step Guide: Adding Certificates
To use S/MIME, you need valid certificates. These consist of a public key (.p7b) and a private key (.p12). Here's how to add them:
- Navigate to the S/MIME section:
- In the menu bar, you'll find the "S/MIME" menu item.
- Upload certificate:
- Click on "Add certificate".
- Upload the file with the public key (.p7b).
- Add private key:
- Then add the file with the private key (.p12).
- Enter the associated password to verify the key with the fingerprint button.
- Verification:
- The system automatically checks the validity of the certificate. If there are problems, you'll receive an error message with instructions on how to fix it.
- Save:
- After successful verification, the certificate is saved and ready for use.
Self-Signed Certificates with Conbool
In addition to certificates issued by Certificate Authorities (CAs), you can also use self-signed certificates. These are particularly useful for internal tests or smaller organizations with limited budgets.
Here's how to create and use a self-signed certificate:
- Click on the Certification Authority icon in the S/MIME section.
- Create a Certification Authority and fill in the data.
- Then click on the Certification Authority and create a certificate with the "+". You'll then find it in your overview.
- Note: Self-signed certificates may not be considered trustworthy by external recipients.