Mobility Electronics NP644 用户手册

NP644 IEEE 802.11g Wireless Network USB Adaptor 

5

YML787 Rev1 

The Advanced Features of the NP644 include the ability to select from several types of 

Wireless Security.
WEP 

 

WEP stands for Wired Equivalent Privacy. Introduced with 

802.11b, WEP  uses encryption to protect data confidentiality

by way of pre-shared keys (passwords or pass-phrases) that are 

entered at both ends. Superseded by WPA and 802.11i but still in 

use.

  

WPA stands for  Wi-Fi Protected Access  - authorizes and 

identifies users based on a secret key that changes automatically

at a pre-defined interval.  This is called TKIP (Temporal Key

Integrity Protocol) to change the temporal key every 10,000 

packets (= unit of data.) Keys can either be pre-shared or 

established by a RADIUS Server.

  

RADIUS is part of 802.11i security; this is a wireless standard 

which is only concerned with wireless security standards.  

Authentication is based around a secure server with a challenge-

and-response method of interaction which verifies the identity

of the client wishing to connect to the network.  If you wish to 

connect to a RADIUS server ask the Network Administrator for 

details. RADIUS servers are not usually used as part of home 

networks.