Manual ZyXEL AG-225H v2 (page 89 of 102) (English)

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ZyXEL AG-225H v2 User’s Guide

Appendix D 89

For added security, certificate-based authentications (EAP-TLS, EAP-TTLS and PEAP) use

dynamic keys for data encryption. They are often deployed in corporate environments, but for

public deployment, a simple user name and password pair is more practical. The following

table is a comparison of the features of authentication types.

WPA and WPA2

Wi-Fi Protected Access (WPA) is a subset of the IEEE 802.11i standard. WPA2 (IEEE

802.11i) is a wireless security standard that defines stronger encryption, authentication and

key management than WPA.

Key differences between WPA(2) and WEP are improved data encryption and user

authentication.

If both an AP and the wireless clients support WPA2 and you have an external RADIUS

server, use WPA2 for stronger data encryption. If you don't have an external RADIUS server,

you should use WPA2-PSK (WPA2-Pre-Shared Key) that only requires a single (identical)

password entered into each access point, wireless gateway and wireless client. As long as the

passwords match, a wireless client will be granted access to a WLAN.

If the AP or the wireless clients do not support WPA2, just use WPA or WPA-PSK depending

on whether you have an external RADIUS server or not.

Select WEP only when the AP and/or wireless clients do not support WPA or WPA2. WEP is

less secure than WPA or WPA2.

Encryption

Both WPA and WPA2 improve data encryption by using Temporal Key Integrity Protocol

(TKIP), Message Integrity Check (MIC) and IEEE 802.1x. WPA and WPA2 use Advanced

Encryption Standard (AES) in the Counter mode with Cipher block chaining Message

authentication code Protocol (CCMP) to offer stronger encryption than TKIP.

Table 32 Comparison of EAP Authentication Types

EAP-MD5 EAP-TLS EAP-TTLS PEAP LEAP

Mutual Authentication No Yes Yes Yes Yes

Certificate – Client No Yes Optional Optional No

Certificate – Server No Yes Yes Yes No

Dynamic Key Exchange No Yes Yes Ye s Yes

Credential Integrity None Strong Strong Strong Moderate

Deployment Difficulty Easy Hard Moderate Moderate Moderate

Client Identity Protection No No Yes Ye s No

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ZyXEL AG-225H v2 Manual

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