Manual Compaq Ipaq 3630 wireless security (page 17 of 30) (English)

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Wireless Security White Paper 17

Virtual Private Networks

Virtual Private Networks (VPNs), also known as "tunnels" and commonly used over the Internet

for wired networks, can keep a wireless network hidden from prying eyes. Security experts

recommend that companies use an additional authentication system such as a VPN before

allowing data to cross from a wireless network to an intranet or other corporate system. VPNs

have the following characteristics:

• User Authentication. The VPN must verify the user’s identity and restrict VPN access to

authorized users. The VPN must also provide audit and accounting records to show who

accessed what information and when.

• Address Management. The VPN must assign a client’s address on the private network and

assure that addresses are kept private.

• Data Encryption. The VPN must encrypt information transmitted on the public network.

• Key Management. The VPN must generate and refresh encryption keys for the client and

server.

• Multiprotocol Support. The VPN must handle common protocols used on the public network.

Figure 9 (next page) illustrates a VPN used in conjunction with firewalls.

Figure 9: Virtual Private Network (VPN)

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Compaq Ipaq 3630 wireless security Manual

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