barcode font generator vb.net Figure 14-26. Use the contact form to add the sender s certi cate to your system. in C#

Encoder PDF 417 in C# Figure 14-26. Use the contact form to add the sender s certi cate to your system.

Figure 14-26. Use the contact form to add the sender s certi cate to your system.
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3. Click the Certi cates button (in the Show group). You should see the sender s certi cate listed (see Figure 14-27), and you can view the certi cate s properties by selecting it and clicking Properties. If no certi cate is listed, contact the sender and ask for another digitally signed message.
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Securing Your System, Messages, and Identity
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Figure 14-27. The Certi cates button on the contact form displays the sender s certi cate.
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4. Click Save & Close to save the contact item and the certi cate.
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Obtaining a Recipient s Public Key from a Public CA
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As an alternative to receiving a signed message with a certi cate from another person, you might be able to obtain the person s certi cate from the issuing CA. For example, if you know that the person has a certi cate from VeriSign, you can download that individual s public key from the VeriSign Web site. Other public CAs offer similar services. To search for and download public keys from VeriSign (see Figure 14-28), connect to https://digitalid.verisign.com/services/client/index.html. Check the sites of other public CAs for similar links that enable you to download public keys from their servers. The process for downloading a public key varies by CA. In general, however, you enter the person s e-mail address in a form to locate the certi cate, and the form provides instructions for downloading the certi cate. You should have no trouble obtaining the public key after you locate the certi cate on the CA (there is a link to download the public key certi cate from the CA to a le on your computer). Save the public key to disk, and then follow these steps to install the key: 1. Open the Contacts folder in Outlook 2007. 2. Locate the contact for whom you downloaded the public key. 3. Open the contact item, and then click the Certi cates button. 4. Click Import. Browse to and select the certi cate le obtained from the CA and click Open. 5. Click Save & Close to save the contact changes.
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Encrypting Messages
Figure 14-28. VeriSign, like other public CAs, provides a form you can use to search for and obtain public keys for certi cate subscribers.
Sending Encrypted Messages
When you have everything set up for sending and receiving encrypted messages, it s a simple matter to send one: 1. Open Outlook 2007 and compose the message. 2. In the message form, click the Encrypt icon in the Options group (on the Message tab). Alternatively, do the following: 1. On the Message tab, click the Message Options Dialog Box Launcher in the Options group that displays the Message Options dialog box, and then click Security Settings. 2. Select Encrypt Message Contents And Attachments, and then click OK. 3. Click Close, and then send the message as you normally would. 4. If the message is protected by Exchange Server security, you can send it in one of three ways, depending on your system s security level: If the security level is set to Medium (the default), Outlook 2007 displays a message informing you of your security setting. Click OK to send the message. If the security level is set to Low, Outlook 2007 sends the message immediately, without any special action on your part. If the security level is set to High, type your password to send the message.
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Note
To make it easier to encrypt a message, you can add the Encrypt command to the Quick Access Toolbar in the message form. For details about the process involved in doing this, see the Troubleshooting sidebar You need a faster way to digitally sign a message, earlier in this chapter.
Reading Encrypted Messages
When you receive an encrypted message, you can read it as you would read any other message, assuming that you have the sender s certi cate. Double-click the message to open it. Note that Outlook 2007 uses an icon with a lock instead of the standard envelope icon to identify encrypted messages.
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