Motorola WS5100 Series Reference Manual page 133

Configuring WPA/WPA2 using TKIP and CCMP
Wi-Fi Protected Access (WPA) is a robust encryption scheme specified in the IEEE Wireless Fidelity (Wi-Fi)
standard, 802.11i. WPA provides more sophisticated data encryption than WEP. WPA is designed for
corporate networks and small-business environments where more wireless traffic allows quicker discovery
of encryption keys by an unauthorized person.
WPA's encryption method is Temporal Key Integrity Protocol (TKIP). TKIP addresses WEP's weaknesses with
a re-keying mechanism, a per-packet mixing function, a message integrity check, and an extended
initialization vector. WPA also provides strong user authentication based on 802.1x EAP.
WPA2 is a newer 802.11i standard that provides even stronger wireless security than WPA and WEP. CCMP
is the security standard used by the Advanced Encryption Standard (AES). AES serves the same function TKIP
does for WPA-TKIP. CCMP computes a Message Integrity Check (MIC) using the proven Cipher Block Chaining
(CBC) technique. Changing just one bit in a message produces a totally different result.
WPA2-CCMP is based on the concept of a Robust Security Network (RSN), which defines a hierarchy of keys
with a limited lifetime (similar to TKIP). Like TKIP, the keys the administrator provides are used to derive other
keys. Messages are encrypted using a 128-bit secret key and a 128-bit block of data. The end result is an
encryption scheme as secure as any the switch provides.
To configure WPA/WPA2-TKIP/CCMP encryption:
1. Select Network > Wireless LANs
2. Select an existing WLAN from those displayed within the
A WLAN screen displays with the WLAN's existing configuration. Refer to the
Encryption columns to assess the WLAN's existing security configuration.
3. Select either the WPA/WPA2-TKIP
Encryption field.
4. Click the Config button to the right of the WPA/WPA2-TKIP and WPA2-CCMP checkboxes.
The WPA/WPA2-TKIP/CCMP
WPA2-TKIP or WPA-CCMP.
from the main menu tree.
or WPA2-CCMP button from within the
screen displays. This single screen can be used to configure either WPA/
Configuration tab and click the
Authentication
4-51
Network Setup
Edit button.
and