User's Manual
3-27
If the security notification is ignored, access is denied after a preset timeout
period expires.
Advantages: Stronger security.
Disadvantages: Passkeys must be protected.
3-3.1.2.5 Link Keys
To avoid entering a passkey time-after-time for a known and trusted remote device, a link
key can be created.
A link key is a mathematical construct created from:
x The passkey.
x The Bluetooth Device Address (BDA) of the remote device.
x An internally generated, random number.
There is no limit to the number of link keys that may be created.
Devices that share a link key are “paired.”
Paired devices are authenticated automatically, without operator intervention.
3-3.2 PAIRING
BTW users usually will want to pair
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the devices frequently used for Bluetooth wireless
connections. This will save time by minimizing interaction with BTW security
processes—such as passkey entry and authorization.
For example, if you pair your laptop computer and cellular telephone, persistent security
is established between the devices. This will enable the laptop to quickly access the
Internet with a Dial-Up Networking connection on the cellular telephone without entering
passkeys after the initial connection is made.
Devices are paired through BTW’s BTTray Security window. This process can take place
at the time of the first connection between two devices, or for ease of use, can be done
before the first connection is made.
Only pair devices that are in your control—your cellular telephone, your laptop
computer, your desktop computer. Additionally, give the paired devices access to only
those services that will be used. For example, a laptop is most likely only going to use the
cellular telephone’s Dial-Up Networking service.
Once a device is paired it remains paired even if the user:
x Stops the Bluetooth connection(s) between the devices.
x Reboots one or both devices.
x Stops and starts the services on the devices.
NOTE: A paired device will be displayed in the Bluetooth Neighborhood window even if
the device is not within radio range and/or powered on at the time Bluetooth
Neighborhood is opened and explored.
For additional information on how to pair a specific device, refer to the quick-start guide
or other setup manual received with your Bluetooth device.
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Pairing is also referred to as bonding.