A pair of devices may establish a trusted relationship. They need to learn a shared secret (often called passkey or PIN) in order to be paired (this is the term associated with establishing the trusted relationship). If two devices are paired, they'll be able to cryptographically authenticate their identity and they optionally may also encrypt data transferred through the air.
In the pairing process, a link key will be generated out of the submitted PIN. A pairing is permanent even if the device name changes, because each involved device will save the link key and the corresponding physical address in its file system. However, some devices with small amounts of memory are only able to store a limited amount of device pairing information. Since an established pairing is stored and re-used on every connection, you need to delete the pairing if one of your devices is lost or stolen.
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