barcode excel 2003 free Figure 11-37 SSL at work in Software

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Figure 11-37 SSL at work
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SSL has now been greatly updated to a new standard called Transport Layer Security (TLS) TLS is very similar to SSL, working in almost the same way TLS is more robust and flexible and works with just about any TCP application SSL is limited to HTML, FTP, SMTP, and a few older TCP applications TLS has no such restrictions and is used in securing Voice over IP (VoIP) and virtual private networks (VPNs), but it is still most heavily used in securing Web pages Every Web browser today uses TLS for HTTPS-secured Web sites, and EAP-TLS is common for more-secure wireless networks NOTE SSL/TLS also supports mutual authentication, but this is relatively rare
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Every authentication and encryption protocol and standard you ve learned about so far works above the Network layer of the OSI seven-layer model Internet Protocol Security (IPSec) is an encryption protocol that works at the Network layer and, while not very popular currently, will soon become the dominant encryption protocol as IPv6 begins to roll out in the next few years (See 13, IPv6, for details on the upcoming IPv6)
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IPSec works in two different modes: Transport mode and Tunnel mode In Transport mode, only the actual payload of the IP packet is encrypted: the destination and source IP addresses, port numbers, and other IP header information is still readable In Tunnel mode, the entire IP packet is encrypted and then placed into an IPSec endpoint where it is encapsulated inside another IP packet The mode you use depends on the application (Figure 11-38) IPv6 will use the IPSec Transport mode by default
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Figure 11-38 IPSec s two modes
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Tunnel mode
IPSec has a strong authentication Not only does IPSec support Internet Key Exchange (IKE, the standard for exchanging keys on the Internet), it aggressively protects against attacks by adding an authentication header (AH) to every IP packet that uses IPSec While a full discussion of the AH is way beyond the scope of the CompTIA Network+ exam, you should understand that the AH s two different hash values ensure the integrity of every packet IPSec is an incredibly powerful authentication/encryption protocol, but until IPv6 is widely implemented its only common current use is creating secure tunnels between two computers: a job it performs very well Keep an eye out for IPSec!
Secure TCP/IP Applications
We ve covered quite a few TCP/IP security standards and protocols thus far in the chapter, but we really haven t put anything to work yet It s now time to talk about actual applications that use these tools to make secure connections As mentioned earlier, this is in no way a complete list, as there are thousands of secure TCP applications; we ll stick to ones you will see on the CompTIA Network+ exam Even within that group, I ve saved discussion of some of the applications for other chapters that deal more directly with certain security aspects (such as remote connections)
11: Securing TCP/IP
NOTE Of all the protocols and standard discussed so far, only SSH is also an application
HTTPS
You ve already seen HTTPS back in 9 so let s do a quick review and then take the coverage a bit deeper You know that HTTPS documents are unique pages that traditionally start with https:// and that most browsers also show a small lock icon in the lower-right corner or in the address bar You also know that HTTPS uses SSL/TLS for the actual authentication and encryption process In most cases, all of this works very well, but what do you do when HTTPS has trouble Since you won t get an HTTPS connection without a good certificate exchange, the most common problems are caused by bad certificates When a certificate comes in from an HTTPS Web site, your computer checks the expiration date to verify the certificate is still valid and checks the Web site s URL to make sure it s the same as the site you are on If either of these is not correct, you get an error such as shown in Figure 11-39
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