A passkey is like a PIN (Personal Identification Number), it uses four numbers programmed in both Bluetooth devices (your device and the device you are connecting to), to identify them and create a trusted pair. A trusted pair is when two devices agree to communicate with each other, via one device recognizing the other device, which allows the transaction to bypass the regular discovery and authentication procedures that occur with a transaction. It's like a proof of identification needed to get to a certain spot that is heavily encrypted. To find out the source of this information and more information about Bluetooth pairing, go to this website- http://kb.palmone.com/SRVS/CGI-BIN/WEBCGI.EXE?New,kb=PalmSupportKB,t=ooccase,case=obj(14817).
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