Motorola ET1 User's Guide download pdf (Page 56)

5 - 2 ET1 Enterprise Tablet User Guide

Security

The current Bluetooth specification defines security at the link level. Application-level security is not specified.

This allows application developers to define security mechanisms tailored to their specific need. Link-level

security occurs between devices, not users, while application-level security can be implemented on a per-user

basis. The Bluetooth specification defines security algorithms and procedures needed to authenticate devices,

and if needed, encrypt the data flowing on the link between the devices. Device authentication is a mandatory

feature of Bluetooth while link encryption is optional.

Pairing of Bluetooth devices is accomplished by creating an initialization key that is used to authenticate the

devices and create a link key for them. Entering a common personal identification number (PIN) number in the

devices being paired generates the initialization key. The PIN number is never sent over the air. By default, the

Bluetooth stack responds with no key when a key is requested (it is up to user to respond to the key request

event). Authentication of Bluetooth devices is based-upon a challenge-response transaction. Bluetooth allows

for a PIN number or passkey that is used to create other 128-bit keys used for security and encryption. The

encryption key is derived from the link key used to authenticate the pairing devices. Also worthy of note is the

limited range and fast frequency hopping of the Bluetooth radios that makes long-distance eavesdropping

difficult.

Recommendations are:

•

Perform pairing in a secure environment

•

Keep PIN codes private and don't store the PIN codes in the ET1

•

Implement application-level security.

The ET1 supports the following Bluetooth services:

•

Generic Access Profile (GAP) - Must support both Initiator and Acceptor roles

•

Service Discovery Protocol (SDP) - Supports both Local Device and Remote Device.

•

Serial Port Profile (SPP) - Supports both Device A and Device B roles.

•

Human Interface Device Profile (HID) - Supports Host role.

Bluetooth Power States

Suspend

When there is an active Bluetooth connection, the Bluetooth radio turns off.

Resume

When the ET1 resumes, Bluetooth turns on if it was on prior to suspend.

NOTE It is not recommended to perform Bluetooth wireless technology inquiry when high rate 802.11b operation is

required.

NOTE If there is an active Bluetooth connection between the ET1 and another Bluetooth device and there is no

data activity, the ET1 will time out. However, if the user presses the Power button on the ET1, the ET1 will

suspend and upon receiving data from a remote Bluetooth device, the ET1 will wake from suspend

mode. For example, Bluetooth scanner sending data to the ET1.

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