Netgear WG111v2 Betriebsanweisung PDF herunterladen (Seite 60)

User Manual for the NETGEAR 54 Mbps Wireless USB 2.0 Adapter WG111

B-4 Wireless Networking Basics

202-10026-01

Figure 4-1: 802.11 open system authentication

Shared Key Authentication

The following steps occur when two devices use Shared Key Authentication:

1. The station sends an authentication request to the access point.

2. The access point sends challenge text to the station.

3. The station uses its configured 64-bit or 128-bit default key to encrypt the challenge text, and

sends the encrypted text to the access point.

4. The access point decrypts the encrypted text using its configured WEP Key that corresponds

to the station’s default key. The access point compares the decrypted text with the original

challenge text. If the decrypted text matches the original challenge text, then the access point

and the station share the same WEP Key and the access point authenticates the station.

5. The station connects to the network.

If the decrypted text does not match the original challenge text (i.e., the access point and station do

not share the same WEP Key), then the access point will refuse to authenticate the station and the

station will be unable to communicate with either the 802.11 network or Ethernet network.

This process is illustrated in below.

INTERNET LOCAL

ACT

12345678

LNK

LNK/ACT

100

Cable/DSL

ProSafeWirelessVPN Security Firewall

MODEL

FVM318

PWR TEST

WLAN

Enable

Access Point (AP)

1) Authentication request sent to AP

2) AP authenticates

3) Client connects to network

802.11 Authentication

Open System Steps

Cable or

DLS modem

Client

attempting

to connect

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