Netgear MA111v2 User's Guide download pdf (Page 52)

User Manual for the NETGEAR 11 Mbps Wireless USB Adapter MA111

B-6 Wireless Networking Basics

202-10032-01

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.

Figure 4-4: 802.11 shared key authentication

Overview of WEP Parameters

Before enabling WEP on an 802.11 network, you must first consider what type of encryption you

require and the key size you want to use. Typically, there are three WEP Encryption options

available for 802.11 products:

1. Do Not Use WEP: The 802.11 network does not encrypt data. For authentication purposes,

the network uses Open System Authentication.

2. Use WEP for Encryption: A transmitting 802.11 device encrypts the data portion of every

packet it sends using a configured WEP Key. The receiving 802.11b device decrypts the data

using the same WEP Key. For authentication purposes, the 802.11b network uses Open

System Authentication.

3. Use WEP for Authentication and Encryption: A transmitting 802.11 device encrypts the

data portion of every packet it sends using a configured WEP Key. The receiving 802.11

device decrypts the data using the same WEP Key. For authentication purposes, the 802.11

network uses Shared Key Authentication.

INTERNET LOCAL

ACT

12345678

LNK

LNK/ACT

100

Cable/DSL

ProSafeWirelessVPN SecurityFirewall

MODEL

FVM318

PWR TEST

WLAN

Enable

Access Point (AP)1) Authentication

request sent to AP

2) AP sends challenge text

3) Client encrypts

challenge text and

sends it back to AP

4) AP decrypts, and if correct,

authenticates client

5) Client connects to network

802.11 Authentication

Shared Key Steps

Cable or

DLS modem

Client

attempting

to connect

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