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Encryption methods don t stop at the authentication level There are a number of ways to encrypt network data as well The choice of encryption method is dictated to a large degree by the method used by the communicating systems to connect Many networks consist of multiple networks linked together by some sort of private connection, usually some kind of telephone line like ISDN or T1 Microsoft s encryption method of choice for this type of network is called IPSec (derived from IP security) IPSec provides transparent encryption between the server and the client IPSec will also work in VPNs, but other encryption methods are more commonly used in those situations
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Figure 2325
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When it comes to encryption, even TCP/IP applications can get into the swing of things The most famous of all application encryptions is Netscape s Secure Sockets Layer (SSL) security protocol, which is used
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to create secure Web sites Microsoft incorporates SSL into its more far-reaching HTTPS (HTTP over SSL) protocol These protocols make it possible to create the secure Web sites used to make purchases over the Internet HTTPS Web sites can be identified by the HTTPS:// included in their URL (see Figure 2326) To make a secure connection, your Web browser and the Web server must encrypt their data That means there must be a way for both the Web server and your browser to encrypt and decrypt each other s data This is done by the server sending a public key to your Web browser so the browser knows how to decrypt the incoming data These public keys are sent in the form of a digital certificate This certificate not only provides the public key but also is signed by a trusted authority that guarantees the public key you are about to get is actually from the Web server and not from some evil person trying to pretend to be the Web server There are a number of companies that issue digital certificates to Web sites; probably the most famous is VeriSign, Inc Your Web browser has a built-in list of trusted authorities If a certificate comes in from a Web site that uses one of these highly respected companies, you won t see anything happen in your browser; you ll just go to the secure Web page and a small lock will appear in the lower right-hand corner of your browser Figure 2327 shows the list of trusted authorities built into the Firefox Web browser
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Figure 2326
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23: Computer Security
Figure 2327
Trusted authorities
However, if you receive a certificate from someone not listed in your browser, the browser will warn you and ask if you wish to accept the certificate, as shown in Figure 2328 What you do here is up to you Do you wish to trust this certificate In most cases, you simply say yes, and this certificate is added to your SSL cache of certificates However, there are occasions where an accepted certificate becomes invalid, usually due to something boring, for instance, it goes
Figure 2328
Incoming certificate
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Securing Wireless Networks
Wireless networks are all the rage right now, from your local Starbucks to the neighbors around you Securing wireless networks has, therefore, become an area that CompTIA A+ certified technicians must master You read a lot about wireless networks in 21, Local Area Networking, so turn there now and see if you can answer these questions What is the minimum level of encryption to secure a wireless network What types of wireless will you find for connecting at your local coffee shop
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out of date or the public key changes This never happens with the big name certificates built into your browser you ll see this more often when a certificate is used, for example, in-house on a company intranet and the administrator forgets to update their certificates If a certificate goes bad, your browser issues a warning the next time you visit that site To clear invalid certificates, you need to clear the SSL cache The process varies on every browser, but on Internet Explorer, go to the Content tab under Internet Options and click the Clear SSL state button (Figure 2329)
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