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Suse openSUSE 12.2 Manual

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WEP (dened in IEEE 802.11)
This standard makes use of the RC4 encryption algorithm, originally with a key
length of 40 bits, later also with 104 bits. Often, the length is declared as 64 bits
or 128 bits, depending on whether the 24 bits of the initialization vector are included.
However, this standard has some weaknesses. Attacks against the keys generated
by this system may be successful. Nevertheless, it is better to use WEP than to not
encrypt the network at all.
Some vendors have implemented the non-standard “Dynamic WEP”. It works ex-
actly as WEP and shares the same weaknesses, except that the key is periodically
changed by a key management service.
TKIP (dened in WPA/IEEE 802.11i)
This key management protocol dened in the WPA standard uses the same encryp-
tion algorithm as WEP, but eliminates its weakness. Because a new key is generated
for every data packet, attacks against these keys are fruitless. TKIP is used together
with WPA-PSK.
CCMP (dened in IEEE 802.11i)
CCMP describes the key management. Usually, it is used in connection with WPA-
EAP, but it can also be used with WPA-PSK. The encryption takes place according
to AES and is stronger than the RC4 encryption of the WEP standard.
24.5 Conguration with YaST
IMPORTANT: Security Risks in Wireless Networks
Unencrypted WLAN connections allow third parties to intercept all network
data. Be sure to protect your network trafc by using one of the supported
authentication and encryption methods.
Use the best possible encryption method your hardware allows. However, to
use a certain encryption method, all devices in the network must support this
method, otherwise they cannot communicate with each other. For example, if
your router supports both WEP and WPA but the driver for your WLAN card
only supports WEP, WEP is the least common denominator you can use. But
even a weak encryption with WEP is better than none at all. Refer to Sec-
Wireless LAN 435
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