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Changing Certi cate Trust Relationships
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To have Outlook 2007 authenticate a signed message and treat it as being from a trusted sender, you must add the certi cate to your list of trusted certi cates. An alternative is to con gure Outlook 2007 to inherit trust for a certi cate from the certi cate s issuer. For example, assume that you have a CA in your enterprise. Instead of con gur-
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Signing Messages
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ing each sender s certi cate to be trusted explicitly, you can con gure Outlook 2007 to inherit trust from the issuing CA in other words, Outlook 2007 will implicitly trust all certi cates issued by that CA. Follow these steps to con gure the trust relationship for a certi cate: 1. In Outlook 2007, select the signed message. If the Reading Pane displays an error message, or if you aren t using the Reading Pane, open the message and click the Secure Message button to view the Message Security Properties dialog box (see Figure 14-18). Otherwise, click the Secure Message button in the Reading Pane.
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Figure 14-18. Use the Message Security Properties dialog box to view status and properties of the certi cate.
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2. Click Details, and in the Message Security Properties dialog box, click the Signer line, and then click Edit Trust to display the Trust tab of the View Certi cate dialog box, as shown in Figure 14-19.
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Figure 14-19. Use the Trust tab to con gure the trust relationship for the certi cate.
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Securing Your System, Messages, and Identity
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3. Select one of the following options:
Inherit Trust From Issuer Select this option to inherit the trust relationship
from the issuing CA. For detailed information, see the following section, Con guring CA Trust.
Explicitly Trust This Certi cate Select this option to explicitly trust the certi -
cate associated with the message if you are certain of the authenticity of the message and the validity of the sender s certi cate.
Explicitly Don t Trust This Certi cate Select this option to explicitly distrust the
certi cate associated with the message. Any other messages that you receive with the same certi cate will generate an error message in Outlook 2007 when you attempt to view them. 4. Click OK, click Close to close the Message Security Properties dialog box, and click Close again to close the Digital Signature dialog box.
For information on viewing a certi cate s other properties and con guring Outlook 2007 to validate certi cates, see Viewing and Validating a Digital Signature later in this chapter.
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Con guring CA Trust
Although you might not realize it, your computer system by default includes certi cates from several public CAs (typically VeriSign, Thawte, Equifax, GTE, or several others), which were installed when you installed your operating system. By default, Outlook 2007 and other applications trust certi cates issued by those CAs without requiring you to obtain and install each CA s certi cate. The easiest way to view these certi cates is through Internet Explorer: 1. In Internet Explorer, choose Tools, Internet Options and click the Content tab. 2. Click Certi cates to open the Certi cates dialog box (see Figure 14-20). Click the Trusted Root Certi cation Authorities tab, which contains a list of the certi cates.
Figure 14-20. You can view a list of certi cates in Internet Explorer s Certi cates dialog box.
Signing Messages
If you have a personal certi cate issued by a speci c CA, the issuer s certi cate is installed on your computer. Messages you receive that are signed with certi cates issued by the same CA inherit trust from the issuer without requiring the installation of any additional certi cates. If you re working in a large enterprise with several CAs, however, you ll probably receive signed messages containing certi cates issued by CAs other than the one that issued your certi cate. Thus you might not have the issuing CA s certi cate on your system, which prevents Outlook 2007 from trusting the certi cate. In this case, you need to add that CA s certi cate to your system.
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If you need to connect to a Windows-based enterprise CA to obtain the CA s certi cate and install it on your system, follow these steps: 1. Point your Web browser to http://<machine>/certsrv, where <machine> is the name or IP address of the CA. 2. After the page loads, select Download A CA Certi cate, Certi cate Chain, Or CRL. 3. Select Download CA Certi cate, and then choose to Open (at this point you could also Save it to your computer if you want to save the certi cate le for later use). 4. Click Install Certi cate to install the CA s certi cate on your system. This will launch the Certi cate Import Wizard. Click Next. 5. In the Certi cate Store dialog box, select Automatically Select The Certi cate Store Based Upon The Type Of Certi cate. Click Next and then click Finish to add the CA certi cate. You will be noti ed that the import was successful and will have to click OK twice to close the dialog boxes. The procedure just outlined assumes that the CA administrator has not customized the certi cate request pages for the CA. If the pages have been customized, the actual process you must follow could be slightly different from the one described here.
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