ZyXEL Communications P-334WT Technical Information PDF herunterladen (Seite 48)

mobile device must match the ESSID of the AP to communicate with the AP. The ESSID is a 32-character

maximum string and is case-sensitive.

Security FAQ

1. How do I secure the data across an Access Point's radio link ?

Enable Wired Equivalency Protocol (WEP) to encrypt the payload of packets sent across a radio link.

2. What is WEP ?

Wired Equivalent Privacy. WEP is a security mechanism defined within the 802.11 standard and designed

to make the security of the wireless medium equal to that of a cable (wire). WEP data encryption was

designed to prevent access to the network by "intruders" and to prevent the capture of wireless LAN traffic

through eavesdropping. WEP allows the administrator to define a set of respective "Keys" for each

wireless network user based on a "Key String" passed through the WEP encryption algorithm. Access is

denied by anyone who does not have an assigned key. WEP comes in 40/64-bit and 128-bit encryption key

lengths. Note, WEP has shown to have fundamental flaws in its key generation processing.

What is the difference between 40-bit and 64-bit WEP ?

40 bit WEP & 64 bit WEP are the same encryption level and can interoperate. The lower level of WEP encryption

uses a 40 bit (10 Hex character) as "secret key" (set by user), and a 24 bit " Initialization Vector " (not under user

control) (40+24=64). Some vendors refer to this level of WEP as 40 bit, others as 64 bit.

What is a WEP key ?

A WEP key is a user defined string of characters used to encrypt and decrypt data.

5. Will 128-bit WEP communicate with 64-bit WEP ?

No. 128-bit WEP will not communicate with 64-bit WEP. Although 128 bit WEP also uses a 24

bit Initialization Vector, but it uses a 104 bit as secret key. Users need to use the same encryption

level in order to make a connection.

6. Can the SSID be encrypted ?

WEP, the encryption standard for 802.11, only encrypts the data packets not the 802.11 management

packets and the SSID is in the beacon and probe management messages. The SSID is not encrypted if

WEP is turned on. The SSID goes over the air in clear text. This makes obtaining the SSID easy by

sniffing 802.11 wireless traffic.

By turning off the broadcast of SSID, can someone still sniff the SSID ?

Many APs by default have broadcasting the SSID turned on. Sniffers typically will find the SSID in the

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ZyXEL Communications P-334WT Technical Information Seite 48