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As mentioned, each Certificate bears the Distinguished Name of the Certificate Authority (CA) that issued it, and the CA s digital Signature. A Certificate Authority is expected to be accountable for the validity of the certificates it issues, which means verifying the identity of the certificate owner, and revoking the certificate in the event that it is suddenly rendered invalid before its expiration date, such as when the owner s name or identity changes or if the owner s Private Key is compromised. The Certificate Authority publishes a CA Certificate that consists of the CA s Public Key and Distinguished Name, and the name and digital Signature of either the CA itself or some higher-level CA. If the CA Certificate is signed by the CA itself, it is considered to be self-signed, whereas if it is signed by a higher-level Certificate Authority, it is part of a Certificate Chain (as described later in this chapter). The relationship between a Server Certificate and the CA Certificate is shown in Figure 16 1. It is the duplication of elements between the CA s seal on the Server Certificate and the CA Certificate itself that permits the CA Certificate to verify the Server Certificate.

Figure 16 1. The relationship between a Server Certificate and a CA Certificate This hardly seems like a secure system; the CA is verifying its Signature on the Server Certificate by vouching for itself on the CA Certificate! And how can we trust the CA Certificate if it is simply selfsigned We need some one entity to be authoritative. As is often the case on the Internet, the solution to this riddle resides in the very public nature of the CA Certificate itself. The CA is expected to publish its CA Certificate widely, so that you may verify it by simple comparison across various sources. Once that CA Certificate is verified, it can in turn be used with confidence to validate the Signature on a Server Certificate. The CA Certificates of CAs that commonly issue web server certificates are in fact often distributed along with the web browsers that will need to verify them. Mozilla s Firefox browser, for example, is distributed (in version 3.x) with no fewer than 100 recognized and therefore validated certificates. These certificates are stored in encrypted form in a certificate database file in your browser s default profile directory, named (in Firefox) something like cert8.db. You may view them from within the browser at the Tools Options Advanced Manage Certificates Authorities menu (or in some similar location for other browsers). Figure 16 2 shows the beginning of this list. If you are interested, you may scroll through the list to view sample certificates from both well-known CAs like Thawte and VeriSign, and obscure foreign ones like Staat der Nederlanden or Unizeto.

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Several commercial tools make it easy to capture screenshots. One of my favorites is Screenshot Captor (http://www.donationcoder.com/Software/Mouser/screenshotcaptor/index.html). This product is free to use and has plenty of useful features, yet comes in a lightweight package.

App Store-style list items are structured in the same way as regular Store-list style items. See Listing 11 8 for a stand-alone example.

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