https://devzone.nordicsemi.com/f/nordic-q-a/40837/rf-data-encryptionHello, The Gazell Pairing User Guide in the infocenter states that the AES ECB block is used for encryption &amp; decryption. However, the product specification document for the NRF52840 specifially states that ECB block supports 128 bit encryption onlyen-USTelligent Community 13Mon, 26 Nov 2018 13:03:20 GMThttps://devzone.nordicsemi.com/thread/159020?ContentTypeID=1Mon, 26 Nov 2018 13:03:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f0c9464e-b28c-4199-b538-b482c0d1ad01Kenneth<p>Hi,</p> <p>Gazell pairing is using counter mode, as explained here:<br /><a href="https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_.28CTR.29">https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_.28CTR.29</a>&nbsp;</p> <p>Notice it is using block cipher encryption both for encryption and decryption.</p> <p>There is no error detection, so that must be added either as part of the encrypted packet or in addition.</p> <p>Best regards,<br />Kenneth</p><div style="clear:both;"></div>