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what is different between pairing vs bonding , STK vs LTK

hi all , I am looking out theory about SM layer in BLE . I read CoreV5.0 but I do not understand much about pairing , bonding , STK , LTK . Can you give me some document about that ? Thank !!!

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  • Pairing: Select a key, use this key to encrypt data between these devices. When the devices are disconnected, everything is forgotten and it is if the devices never knew each other. The next time you want to talk secretly to the same device, everything has to be done all over again.

    Bonding: First, do Pairing to have a secure link, then exchange keys for the next time we meet, so that we don't need to perform Pairing again to have a secure link.

    By doing bonding, the user will (for example) not have to enter the 6 digit passkey every time the smartwatch is connected to the phone.

  • Hi , I am working with platform NRF52832 of Nodric . I run my board with example of BLE such as : NUS service, LBS sevice ... and board connect with each other and send data . So , I think my board don't pairing and bonding , it only connect normal in GAP layer . So , I have questions , Is the connection between my boards encrypted ?? And how PDUs package in Link Layer encrypted by ?

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  • Hi , I am working with platform NRF52832 of Nodric . I run my board with example of BLE such as : NUS service, LBS sevice ... and board connect with each other and send data . So , I think my board don't pairing and bonding , it only connect normal in GAP layer . So , I have questions , Is the connection between my boards encrypted ?? And how PDUs package in Link Layer encrypted by ?

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