USRobotics Instant802 APSDK manual Encryption Algorithms

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Professional Access Point Administrator Guide

Key Management

IEEE 802.1x provides dynamically- generated keys that are periodically refreshed.

There are different Unicast keys for each station.

Encryption Algorithm

An RC4 stream cipher is used to encrypt the frame body and cyclic redundancy checking (CRC) of each 802.11 frame.

User Authentication

IEEE 802.1x mode supports a vari- ety of authentication methods, like certificates, Kerberos, and public key authentication with a RADIUS server.

You have a choice of using the Pro- fessional Access Point embedded RADIUS server or an external RADIUS server. The embedded RADIUS server supports Protected EAP (PEAP) and MSCHAP V2.

RECOMMENDATIONS

IEEE 802.1x mode is a better choice than Static WEP because keys are dynamically generated and changed periodically. However, the encryption algorithm used is the same as that of Static WEP and is therefore not as reliable as the more advanced encryption methods such as TKIP and CCMP (AES) used in Wi-Fi Protected Access (WPA) or WPA2.

Additionally, compatibility issues may be cumbersome because of the variety of authentication methods supported and the lack of a standard implementation method.

Therefore, IEEE 802.1x mode is not as secure a solution as Wi-Fi Protected Access (WPA) or WPA2.

SEE ALSO

For information on how to configure IEEE 802.1x security mode, see “IEEE 802.1x” on page 114 under “Configuring Security Settings”.

When to Use WPA/WPA2 Personal (PSK)

Wi-Fi Protected Access 2 (WPA2) Personal Pre-Shared Key (PSK) is an implementation of the Wi-Fi Alliance IEEE 802.11i standard, which includes Advanced Encryption Algorithm (AES), Counter mode/ CBC-MAC Protocol (CCMP), and Temporal Key Integrity Protocol (TKIP) mechanisms. This mode offers the same encryption algorithms as WPA 2 with RADIUS but without the ability to integrate a RADIUS server for user authentication.

This security mode is backward compatible for wireless clients that support only the original WPA.

Key Management

WPA/WPA2 Personal (PSK) pro- vides dynamically-generated keys that are periodically refreshed.

There are different Unicast keys for each station.

Encryption Algorithms

Temporal Key Integrity Protocol (TKIP)

Counter mode/CBC-MAC Proto- col (CCMP) Advanced Encryption Standard (AES)

User Authentication

The use of a Pre-Shared (PSK) key provides user authentication similar to that of shared keys in WEP.

Security - 104

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USRobotics Instant802 APSDK manual Encryption Algorithms