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SSL Record protocol is used to encrypt all data packets, including the SSL Handshake data packets
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SSL is mainly used on e-commerce web sites during the exchange of personal information such as credit card numbers, because SSL can encrypt the traf c between the client and the server
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The Point-to-Point Tunneling Protocol (PPTP) is a VPN protocol used to create an encrypted tunnel over a TCP/IP network such as the Internet All data that passes through the tunnel is in an encrypted format The Point-to-Point Tunneling Protocol was dominant in older Microsoft VPN solutions and used Microsoft Point-to-Point Encryption (MPPE) to encrypt the traf c that passed through the tunnel
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Layer Two Tunneling Protocol (L2TP) is a tunneling protocol similar to PPTP which creates a tunnel over the Internet between two points using PPP data packets encapsulated in TCP/IP protocol packets (for regular networks, you can also use IPX /SPX and NetBEUI) While using IPSec for encryption, the combination will create a VPN L2TP is supported by Windows 2000 and higher operating systems but does not support implementation over ATM, X25, or Frame Relay networks
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Kerberos is a distributed authentication security protocol using private-keys that verify the validity of a user during login and will repeatedly do the same every time a request is made This is useful when a user accesses the network from a workstation that is not secure A workstation might be in a public kiosk and anyone may be allowed to log in to the network as a guest, but regular users may visit the kiosk to log in using their individual user accounts
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The Wired Equivalent Privacy (WEP) protocol is used to encrypt wireless traf c from a wireless client to the wireless access point Once the data reaches the wireless access point, it is decrypted and then sent along the wired network if needed WEP uses a symmetric key con gured on the access point and then on each client used to encrypt the network traf c It has been proved that a WEP encryption key is fairly easy to break with products such as Airsnort or WEPCrack
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11:
Network Security
WiFi Protected Access (WPA) is the answer from the wireless community to provide more security with wireless communications now that WEP has been proved to be vulnerable to hackers WPA has improved upon WEP by offering two key features:
Improved encryption: WPA scrambles the encryption keys by passing them through a hashing algorithm and then performing an integrity check to verify that the keys have not been tampered with The protocol used to scramble the keys is the Temporal Key Integrity Protocol (TKIP), which builds off WEP devices Typically, only a software upgrade is needed for WEP devices to use WPA Authentication: WPA uses EAP as the authentication protocol, which allows for more secure authentication using public key encryption and authentication WEP currently does not offer a method of authentication
8021x
Wireless security has generated much interest within the IT industry because it is such a convenient technology It doesn t need cables all over the place, but still, because of the lack of physical security, some form of authenticating is needed to nd out who is connecting to the wireless network 8021x is a wireless authentication technique that leverages EAP and RADIUS to authenticate a user connecting to the wireless access point Figure 11-22 displays a typical 8021x authentication infrastructure In the gure you can see that the wireless client is connecting to the wireless access point The wireless access point sends the request to the remote access dial-up service (RADIUS) server for the user to be authenticated The RADIUS server challenges Be sure to be familiar with the wireless client for a username and password the protocols used to secure different After the wireless client supplies the username types of network traf c and password to the RADIUS server, the
FIGURE 11-22
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