> #### Detecting a certificate from an unknown Certificate Authority

> If the browser determines that the certificate uses an unknown CA (as is the case with the Fathom demo certificate), a message appears informing you of this fact. Depending on the version of the browser, the content of the message varies.

> ##### When browsing in Netscape

> If you are using the Netscape browser and attempt to connect to a Web site whose certificate uses an unknown CA, you see the message shown in Figure 8–1.

> Figure 8–1: Unknown authority in Netscape

> At this point, you can click either Cancel or Examine Certificate. If you click Cancel, you close the message without accepting the certificate. You will then be prompted each subsequent time you attempt to connect to the machine with the unknown CA.

> If you click Examine Certificate, you see the details shown in Figure 8–2.

> Figure 8–2: Certificate details

> Click Close to return to the previous window, where you are presented with the following three choices:

> - Accept the certificate temporarily for this session
> If you select this option (which is the default), you will be prompted each and every time you attempt to connect to the Web site from this browser. You can then accept the certificate on a session-by-session basis.

> - Accept the certificate permanently
> If you select this option, the certificate is imported into your browser. You will not be prompted when you next connect to the Web site from this browser.

> - Do not accept the certificate and do not connect to this Web site
> If you select this option, your browser session terminates.

> ##### When browsing in Internet Explorer

> If you are using the Internet Explorer browser and attempt to connect to a Web site whose certificate uses an unknown CA, you see the message shown in Figure 8–3.

> Figure 8–3: Security Alert dialog in Internet Explorer

> You have the following three choices:

> - Click Yes to accept the certificate for the current session only.
> - Click No to terminate the session.
> - Click View Certificate.
> The certificate appears, as shown in Figure 8–4.

> Figure 8–4: Certificate details

> The certificate contains three tabs of information: General, Details, and Certification Path.

> To install the certificate:

> 1. Click Install Certificate. The Certification Import Wizard launches:

> 2. Click Next. The Wizard continues:

> 3. Accept the defaults, and click Next. The Wizard completes:

> 4. Click Finish. A message appears informing you that the import was successful.
> Note: If you are using the certificate for testing purposes only, you can remove the certificate from the browser at any time.

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