Manual Suse openSUSE 12.2 (page 451 of 530) (English)

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work. However, the transmission range and number of participating stations are

greatly limited in ad-hoc networks. They also do not support WPA authentication.

If you intend to use WPA security, you should not use Ad-Hoc_Mode.

Master Mode

In master mode your network card is used as the access point. It works only if your

WLAN card supports this mode. Find out the details of your WLAN card on

http://linux-wless.passys.nl.

24.3 Authentication

Because a wireless network is much easier to intercept and compromise than a wired

network, the various standards include authentication and encryption methods. In the

original version of the IEEE 802.11 standard, these are described under the term WEP

(Wired Equivalent Privacy). However, because WEP has proven to be insecure (see

Section 24.6.3, “Security” (page 445)), the WLAN industry (joined under the name Wi-

Fi Alliance) has dened an extension called WPA, which is supposed to eliminate the

weaknesses of WEP. The later IEEE 802.11i standard includes WPA and some other

authentication and encryption methods. IEEE 802.11i is also referred to as WPA2, be-

cause WPA is based on a draft version of 802.11i.

To make sure that only authorized stations can connect, various authentication mecha-

nisms are used in managed networks:

None (Open)

An open system is a system that does not require authentication. Any station can

join the network. Nevertheless, WEP encryption can be used, see Section 24.4,

“Encryption” (page 434).

Shared Key (according to IEEE 802.11)

In this procedure, the WEP key is used for the authentication. However, this proce-

dure is not recommended, because it makes the WEP key more susceptible to at-

tacks. All an attacker needs to do is to listen long enough to the communication

between the station and the access point. During the authentication process, both

sides exchange the same information, once in encrypted form and once in unen-

crypted form. This makes it possible for the key to be reconstructed with suitable

tools. Because this method makes use of the WEP key for the authentication and

for the encryption, it does not enhance the security of the network. A station that

has the correct WEP key can authenticate, encrypt, and decrypt. A station that does

Wireless LAN 433

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Suse openSUSE 12.2 Manual

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