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Chapter 25. Using Outlook Securely > Sending and Receiving Encrypted Messages

Sending and Receiving Encrypted Messages

Your digital certificate also enables you to send encrypted messages. The difference between sending an encrypted message and sending a signed message is that when sending an encrypted message, the recipient must already have a copy of your public key to be able to decrypt the message. The encryption of the message is based on information stored in the recipient's digital ID. Therefore, encryption can be used to send email only to a recipient who has previously sent you a digitally signed message.

Saving a Sender's Public Key

To exchange encrypted mail with another individual, you must have a copy of that person's public key. The easiest way to obtain a copy of someone's public key is for him to send you an email that's digitally signed. The public key is encoded within the email message. After you receive his message, click the messenger icon next to the sender's name and choose Add to Outlook Contacts. If the sender already exists in your Contacts folder, you can merge the existing data with your new data. This process opens a Contact form with the sender's information displayed. Click on the Certificates tab to display Figure 25.18.


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