Atlantis Land A02-AP2-W54M Betriebsanweisung PDF herunterladen (Seite 57)

Wireless MIMO Multi-Function Access Point

A02-AP2-W54M Pag. 51

that the original data can be recovered. Even if one or more

bits in the chip are damaged during transmission, statistical

techniques embedded in the radio can recover the original

data without the need for retransmission. To an unintended

receiver, DSSS appears as low power wideband noise and is

rejected (ignored) by most narrowband receivers.

Question

Would the information be intercepted while transmitting on

air?

Answer

WLAN features two-fold protection in security. On the

hardware side, as with Direct Sequence Spread Spectrum

technology, it has the inherent security feature of scrambling.

On the software side, WLAN offers the encryption function

(WEP) to enhance security and access control.

Question

What is WEP?

Answer

WEP is Wired Equivalent Privacy, a data privacy mechanism

based on a 64-bit or 128-bit shared key algorithm, as

described in the IEEE 802.11 standard.

Question

What is WPA?

Answer

Attempting IEEE802.11i standard, Wi-Fi Alliance has chosen

from preliminary version a group of specifications called

WPA

(Wi-Fi Protected Access).

Specifications of WPA are:

• TKIP Integration (Temporal Key Integrity Protocol) to

allow key change dinamically and

integrity control of

packets.

• Advanced mechanism to manage authentication and

access control to network services in centralized

mode (802.11x through EAP, TLS use is necessary)

• Authentication key is different to key used for

encryption

This protocol is more strong that WEP encryption.

Question

What is WPA2?

Answer

Recently approved by Wi-Fi Alliance, the new standard WPA2

is an evolution of WPA (Wi-Fi Protected Access), supported

by almost compatible IEEE802.11g clients.

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