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Figure 1821
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Firewalls do a great job controlling traffic coming into or out of a network from the Internet, but they do nothing to stop interceptor hackers who monitor traffic on the public Internet looking for vulnerabilities Once a packet is on the Internet itself, anyone with the right equipment can intercept and inspect it Inspected packets are a cornucopia of passwords, account names, and other tidbits that hackers can use to intrude into your network Because we can t stop hackers from inspecting these packets, we must turn to encryption to make them unreadable Network encryption occurs at many different levels and is in no way limited to Internet-based activities Not only are there many levels of network encryption, but each encryption level provides multiple standards and options, making encryption one of
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the most complicated of all networking issues You need to understand where encryption comes into play, what options are available, and what you can use to protect your network
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Network Authentication
Have you ever considered the process that takes place each time a person types in a user name and password to access a network, rather than just a local machine What happens when this network authentication is requested If you re thinking that when a user types in a user name and password, that information is sent to a server of some sort to be authenticated, you re right but do you know how the user name and password get to the serving system That s where encryption becomes important in authentication In a local network, encryption is usually handled by the NOS Because NOS makers usually control software development of both the client and the server, they can create their own proprietary encryptions However, in today s increasingly interconnected and diverse networking environment, there is a motivation to enable different network operating systems to authenticate any client system from any other NOS Modern network operating systems such as Windows NT/2000/XP/2003 and NetWare 4x/5x/6x use standard authentication encryptions like MIT s Kerberos , enabling multiple brands of servers to authenticate multiple brands
Figure 1824
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18: Computer Security
of clients These LAN encryptions are usually transparent and work quite nicely even in mixed networks Unfortunately, this uniformity falls away as you begin to add remote access authentications There are so many different remote access tools, based on UNIX/Linux, Novell NetWare, and Windows serving programs, that most remote access systems have to support a variety of different authentication methods PAP Password Authentication Protocol (PAP) is the oldest and most basic form of authentication It s also the least safe, because it sends all passwords in clear text No NOS uses PAP for a client system s login, but almost all network operating systems that provide remote access service will support PAP for backward compatibility with a host of older programs (like Telnet) that only use PAP CHAP Challenge Handshake Authentication Protocol (CHAP) is the most common remote access protocol CHAP has the serving system challenge the remote client A challenge is where the host system asks the remote client some secret usually a password that the remote client must then respond with for the host to allow the connection MS-CHAP MS-CHAP is Microsoft s variation of the CHAP protocol It uses a slightly more advanced encryption protocol
Configuring Dial-up Encryption
It s the server not the client that controls the choice of dial-up encryption Microsoft clients can handle a broad selection of authentication encryption methods, including no authentication at all On the rare occasion when you have to change your client s default encryption settings for a dial-up connection, you ll need to journey deep into the bowels of its properties Figure 1825 shows the Windows 2000 dialog box, called Advanced Security Settings, where you configure encryption The person who controls the server s configuration will tell you which encryption method to select here
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