Basic Bluetooth Security
Bluetooth security implementation revolves around making devices as well as services offered by them secure. This is a continuous effort that is being undertaken by the manufacturers of devices that use Bluetooth.
For example, between devices, there are two levels, "trusted device" and "untrusted device". A trusted device, having been paired with one's other device, has unrestricted access to all services offered by the latter.
With respect to the services of the devices, three levels of security are defined: services that require authorisation and authentication, services that require authentication only, and services that are open to all devices. RedNova News - Technology - Basic Bluetooth Security
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