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Originally Posted by Paul
What are Combination Keys?
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They are needed for security when pairing up devices. For more details see
here.
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Unlike 802.11b, Bluetooth uses two different keys for authentication and encryption. Authentication uses link keys, which can be either unit keys or combination keys. A unit key means the same key applies for each connection from a particular device. A combination key is different for each particular set of devices. The Bluetooth Special Interest Group recommends the use of combination keys for authentication, thus preventing the possibility of communication between two devices being overheard by a third device that has been paired with the originating device. To provide further security, it is recommended that this initial pairing take place in a private location.
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