BL600 MODULE WHISPER MODE
The goals of this document include thefollowing:
▪ To explain how to use Laird’s BL600 module in whisper mode pairing.
▪ To test the Whisper Mode functionality through the use of a BTv4.0-enabled iOS device.
OVERVIEW：
Security is a critical issue in wireless communication. In Bluetooth Low Energy(BLE), when two devices wish to communicate securely,Simple Secure Pairingis used. This process establishes a secret link key to correctly authenticate devices. However, in most cases the pairing process itself is carried out on the same exposed wireless mediumand is therefore still vulnerable to interceptions and attacks.
To enhance securityand ease during the pairing process, Laird developed a unique approach which involvesthe transmission power being significantly decreased while pairing is in progress. This ensures that pairing is not completed unless the devices are within a relatively close proximity to each other. This behavioris known as Whisper Mode Pairing. This proximity-enhanced security adds the extra level of trust that can be used to authenticate BLE devices. An additional benefit of Whisper Mode is that end users of products that are implementing Laird’s BL600 can be certain they are connecting to the correct, intended remote device by simply bringing them intoclose proximity. Finally, Laird’s whisper mode may decrease footprint and BOM costs for OEMs by removing requirements for additional wireless technologies, such as Near Field Communications (NFC); it provides similar attributes from within the BL600 module.
Whisper mode pairing is achieved with the function BleTxPwrWhilePairing(). This function, called once at startup,sets the transmit power of all packets that are transmitted while pairing is in progress. Radial measurements have shown that setting the pairing transmit power to -55 createsa ‘bubble’ with a radius of about 30 cm, outside which pairing will not succeed. This should be decreased even further if the BL600 is covered by the final product enclosures which affect the radio’s overall RF performance.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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08 Jan 2015 |
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v1.0 |
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485 KB |
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