Monday, October 5, 2009
Wireless help us easy to connect to internet without using any external devices such as cable ,
switch, hub and so on.
Wireless is help us reduce the space. For connect to wireless, we only need access
point(AP) and wireless station(Eg: desktop, laptop,PDA)
In 1997, IEEE produce a Wi-Fi(802.11). Two type of wireless mode use in wireless connection:
1. Ad-Hoc Mode - connect without using access point, it is easy and called as peer-to-peer.
2. Infrastructure - at least need one access point.There are two type
a) Basic Service Set (BSS) - one Access Point
b) Extended Servce Set (ESS) - more than one BSS.
Wireless LAN (WLAN) is service of 802.11 which use Layer 1(Physical Layer) and Layer 2
(Data Link Physical). There are 3 basic security service in WLAN environment. First is authentication
which provide a security to identify an identity in communication. Second is an integrity to check
that the message from sender to receiver is secure without get attack or modify by hacker.Because
an attack also can manipulate message through access point.Third is confidentially, is to ensure that
there is secret between network and privacy all the detail.
In wireless connection, Wired Equivalence Privacy(WEP) is use for shared key between PC/laptop with access
point and provide the extended service set(for ensure access point have same shared key).
WPA is Wi-Fi Protected Access which use in 802.11a, 802.11b and 802.11g. This use to solve the
problem with Wired Equivalence Privacy because it used on small amd handled device for connectivity.
Wireless Transport Layer Security(WTLS) use to make sure the data is privacy before it being broadcast.
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