https://devzone.nordicsemi.com/f/nordic-q-a/10913/pairing-and-securityHi. I use the &#39;sdk 6&#39; and &#39;s110_nrf51822_7.1.0_softdevice&#39;. I would like to add security. I tried to passkey. If i enter passkey, it is possible to bond. but It is not required passkey, if i try to do pairing. In this case. when i do pairing, althoughen-USTelligent Community 13Thu, 17 Dec 2015 14:57:14 GMThttps://devzone.nordicsemi.com/thread/40794?ContentTypeID=1Thu, 17 Dec 2015 14:57:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:24ae1247-3d04-41e9-bc01-6c003c8e139bPetter Myhre<p>Could you explain a bit more on how you have implemented this? Have you set attribute permission of the secure characteristic value with BLE_GAP_CONN_SEC_MODE_SET_ENC_WITH_MITM()?</p><div style="clear:both;"></div>