Simulation of insecure legacy pairing using nRF52840 dongles and nrf Connect for Desktophttps://devzone.nordicsemi.com/f/nordic-q-a/121208/simulation-of-insecure-legacy-pairing-using-nrf52840-dongles-and-nrf-connect-for-desktopGreetings, everyone, I have encountered a configuration(?) problem while trying to setup a lab for a BLE course I am teaching. The idea is to showcase the vulnerability of legacy connections and pairing. I seek to do that via pairing 2 dongles withen-USTelligent Community 13Sun, 11 May 2025 20:31:46 GMTRE: Simulation of insecure legacy pairing using nRF52840 dongles and nrf Connect for Desktophttps://devzone.nordicsemi.com/thread/534771?ContentTypeID=1Sun, 11 May 2025 20:31:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2cca6553-43b9-4462-a3b3-feaa2d75f02bNikita Kokhan<p>Thank you very much, it worked!</p><div style="clear:both;"></div>RE: Simulation of insecure legacy pairing using nRF52840 dongles and nrf Connect for Desktophttps://devzone.nordicsemi.com/thread/534188?ContentTypeID=1Wed, 07 May 2025 06:10:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2696a2c3-37d1-4221-87d7-e627a59a230cVidar Berg<p>Hello,</p> <p>Please check if&nbsp;<a href="https://github.com/zephyrproject-rtos/zephyr/blob/3dcc1d2dd6e1c0a29f6b1c772777d00f46377de8/subsys/bluetooth/host/Kconfig#L562">CONFIG_SMP_SC_ONLY</a>&nbsp;is selected in your build (build/&lt;prj name&gt;/zephyr/.conf). This config setting enforces security level 4 which cannot be reached with legacy pairing and would explain the authentication failure.</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>