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Appendix B - Wireless Technology
199
NXD-700Vi 7" Modero® Wall/Flush Mount Touch Panel with Intercom
WPA
Wi-Fi Protected Access (WPA and WPA2) is a class of system used to secure wireless (Wi-Fi)
computer networks. It was created in response to several serious weaknesses researchers had
found in the previous WEP system. WPA implements the majority of the IEEE 802.11i
standard, and was intended as an intermediate measure to take the place of WEP while
802.11i was prepared (WPA2).
WPA is designed to work with all wireless network interface cards, but not necessarily with
first generation wireless access points.
To resolve problems with WEP, the Wi-Fi Alliance released WPA (FIG. 98) which integrated
802.1x, TKIP and MIC. Within the WPA specifications the RC4 cipher engine was
maintained from WEP. RC4 is widely used in SSL (Secure Socket Layer) to protect internet
traffic.
FIG. 98 WPA Overview