D-Link DWL-2200AP [82/192] Field description

Select the cipher you want to use from the drop-down menu:

• TKIP

• CCMP (AES)

• Both

Temporal Key Integrity Protocol (TKIP) is the default.

TKIP provides a more secure encryption solution than WEP keys. The

TKIP process more frequently changes the encryption key used and better

ensures that the same key will not be reused to encrypt data (a weakness

of WEP). TKIP uses a 128-bit “temporal key” shared by clients and access

points. The temporal key is combined with the client’s MAC address and

a 16-octet initialization vector to produce the key that will encrypt the data.

This ensures that each client station uses a different key to encrypt data.

TKIP uses RC4 to perform the encryption, which is the same as WEP. But

TKIP changes temporal keys every 10,000 packets and distributes them,

thereby greatly improving the security of the network.

Counter mode/CBC-MAC Protocol (CCMP) is an encryption method for

IEEE 802.11i that uses the Advanced Encryption Algorithm (AES). It uses

a CCM combined with Cipher Block Chaining Counter mode (CBC-CTR)

and Cipher Block Chaining Message Authentication Code (CBC-MAC) for

encryption and message integrity.

When the authentication algorithm is set to “Both”, both TKIP and AES

clients can associate with the access point. Client stations configured to

use WPA with RADIUS must have one of the following to be able to

associate with the AP:

• A valid TKIP RADIUS IP address and valid shared Key

• A valid CCMP (AES) IP address and valid shared Key

Clients not configured to use WPA with RADIUS will not be able to associate

with AP.

Both is the default. When the authentication algorithm is set to “Both”,

client stations configured to use WPA with RADIUS must have one of the

following:

• A valid TKIP RADIUS IP address and RADIUS Key

• A valid CCMP (AES) IP address and RADIUS Key

Cipher Suites

Field Description

Configuring Security