Rockwell Automation 2727-T7P30D1F MobileView Tablet T750 User Manual - Manual (Page 64)

Publication 2727-UM001D-EN-P - March 2004
5-10 Communications Configuration
Static WEP Keys
Each device within your wireless network can be assigned up to four
static WEP keys. If a device receives a packet that is not encrypted
with the appropriate key (as the WEP keys of all devices that are to
communicate with each other must match), the device discards the
packet and never delivers it to the intended receiver.
Static WEP keys are write-only and temporary; therefore, they cannot
be read back from the client adapter and they are lost when power to
the adapter is removed or the Windows CE device is rebooted.
Although the keys are temporary, you do not need to re-enter them
each time the client adapter is inserted or the Windows CE device is
rebooted. This is because the keys are stored (in an encrypted format
for security reasons) in the registry of the Windows CE device. When
the driver loads and reads the client adapter’s registry parameters, it
also finds the static WEP keys, unencrypts them, and stores them in
volatile memory on the adapter.
The CEM utility enables you to view the current WEP key settings for
the client adapter and then to assign new WEP keys or overwrite
existing WEP keys, and the Aironet Client Utility (ACU) allows you to
enable or disable static WEP. Refer to the “Using Static WEP” section
on page 5-15 for instructions.
Dynamic WEP Keys with LEAP
The new standard for wireless LAN security, as defined by the Institute
of Electrical and Electronics Engineers (IEEE), is called 802.1X for
802.11 or simply 802.1X. An access point that supports 802.1X and its
protocol, Extensible Authentication Protocol (EAP), acts as the
interface between a wireless client and an authentication server, such
as a Remote Authentication Dial-In User Service (RADIUS) server, to
which the access point communicates over the wired network.
TIP
Prior versions of the client software for Windows CE
permitted WEP keys to be stored in either Flash
memory (persistent) or volatile memory (temporary).
If your client adapter has WEP keys that are stored in
Flash memory from a prior release, Client Encryption
Manager (CEM) version 2.10 or greater allows you to
store WEP keys only in volatile memory, and these
keys are used instead of those stored in Flash
memory.