use encryphon key to encrypt. The link layer security mechanism provides a great deal of certification schemes and a flexible encryption scheme (means allow the consultation of the length of password). This mechanism is very important when the equipments munication are from different countries, because some countries will specify maximum password length. Bluetooth system will select the smallest maximum allowable password length of all equipments in the . РBluetooth system also supports the high level of protocol stack in different applications of special security mechanisms. Bluetooth security mechanism builds trust relationship between devices relying on pins. Once this relationship established, these pins can be stored in the equipment, in order to connection more quickly the next time.
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