https://devzone.nordicsemi.com/f/nordic-q-a/76818/questions-about-ble-security-levelsWe made the product by adopting BLE security mode 1, level 4. According to the analysis of our products by the wireless communication certification authority, We received feedback that &quot;SMP Pairing Request&quot; should be encrypted. Does &quot;SMP Pairing Featureen-USTelligent Community 13Mon, 28 Jun 2021 11:59:48 GMThttps://devzone.nordicsemi.com/thread/317468?ContentTypeID=1Mon, 28 Jun 2021 11:59:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0690b6b7-a1ae-4414-89b2-4b9df691db4aEinar Thorsrud<p>Hi,</p> [quote user=""]According to the analysis of our products by the wireless communication certification authority,<br />We received feedback that &quot;SMP Pairing Request&quot; should be encrypted.[/quote] <p>That is not possible. The SMP Pairing Request marks the beginning of the pairing procedure (after exchanging the pairing features). The primary purpose of the pairing procedure is to exchange encryption keys. It is not possible to encrypt the link before exchanging the keys.</p> [quote user=""]Does &quot;SMP Pairing Feature Exchange&quot; need to be encrypted to satisfy BLE security mode 1 and level 4?[/quote] <p>No. It is not needed, and not even possible.</p><div style="clear:both;"></div>