ZyXEL Communications G-470, Руководство пользователя

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G-470 User’s Guide
Chapter 3 Wireless LAN Network 33
5 Additionally, Jenny uses her own private key to encrypt a message and Tim uses Jenny’s
public key to decrypt the message.
The certification authority uses its private key to sign certificates. Anyone can then use the
certification authority’s public key to verify the certificates.
3.2.1.2 WEP
3.2.1.2.1 Data Encryption
WEP (Wired Equivalent Privacy) encryption scrambles all data packets transmitted between
the ZyXEL Device and the AP or other wireless stations to keep network communications
private. Both the wireless stations and the access points must use the same WEP key for data
encryption and decryption.
There are two ways to create WEP keys in your ZyXEL Device.
• Automatic WEP key generation based on a “password phrase” called a passphrase. The
passphrase is case sensitive. You must use the same passphrase for all WLAN adapters
with this feature in the same WLAN.
For WLAN adapters without the passphrase feature, you can still take advantage of this
feature by writing down the four automatically generated WEP keys from the Security
Settings screen of the ZyXEL utility and entering them manually as the WEP keys in the
other WLAN adapter(s).
• Enter the WEP keys manually.
Your ZyXEL Device allows you to configure up to four 64-bit or 128-bit WEP keys.
Only one key is used as the default key at any one time.
3.2.1.2.2 Authentication Type
The IEEE 802.11b/g standard describes a simple authentication method between the wireless
stations and AP. Three authentication types are defined:
Auto , Open System and Shared
Key .
• Open System mode is implemented for ease-of-use and when security is not an issue.
The wireless station and the AP or peer computer do not share a secret key (WEP key).
Thus the wireless stations can associate with any AP or peer computer and listen to any
transmitted data that is not encrypted.
• Shared Key mode involves a shared secret key (WEP key) to authenticate the wireless
station to the AP or peer computer. This requires you to enable the wireless LAN security
and use same settings on both the wireless station and the AP or peer computer.
• Auto authentication mode allows the ZyXEL Device to switch between the open system
and shared key modes automatically. Use the auto mode if you do not know the
authentication mode of the other wireless stations.