AirLive WN-370USB - Manual (Page 40)

5. Appendix
AirLive WN-370USB User’s Manual 36
Preamble Type
There are two preamble types defined in IEEE 802.11 specification. A long preamble
basically gives the decoder more time to process the preamble. All 802.11 devices support
a long preamble. The short preamble is designed to improve efficiency (for example, for
VoIP systems). The difference between the two is in the Synchronization field. The long
preamble is 128 bits, and the short is 56 bits.
WPA2
It is the second generation of WPA. WPA2 is based on the final IEEE 802.11i amendment to
the 802.11 standard.
Temporal Key Integrity Protocol (TKIP)
The Temporal Key Integrity Protocol, pronounced tee-kip, is part of the IEEE 802.11i
encryption standard for wireless LANs. TKIP is the next generation of WEP, the Wired
Equivalency Protocol, which is used to secure 802.11 wireless LANs. TKIP provides
per-packet key mixing, a message integrity check and a re-keying mechanism, thus fixing
the flaws of WEP.
802.1x Authentication
802.1x is a framework for authenticated MAC-level access control, defines Extensible
Authentication Protocol (EAP) over LANs (WAPOL). The standard encapsulates and
leverages much of EAP, which was defined for dial-up authentication with Point-to-Point
Protocol in RFC 2284. Beyond encapsulating EAP packets, the 802.1x standard also
defines EAPOL messages that convey the shared key information critical for wireless
security.
Advanced Encryption Standard (AES)
Security issues are a major concern for wireless LANs, AES is the U.S. government’s
next-generation cryptography algorithm, which will replace DES and 3DES.