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User’s Manual for the Wireless Digital Media Player MP115
B-6 Wireless Networking Basics
November 2004 202-10038-01
WEP Shared Key Authentication
This process is illustrated below.
Figure B-2: 802.11 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.
INTERNET LOCAL
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ProSafeWirelessVPNSecurityFirewall
MODEL
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PWR TEST
WLAN
Enable
Access Point1) Authentication
request senttoAP
2) APsends challengetext
3) Clientencrypts
challenge text and
sends itback to AP
4) APdecrypts,andif correct,
authenticates client
5) Clientconnects to network
Shared Key
Authentication Steps
Cableor
DLSmodem
Client
attempting
to connect