https://devzone.nordicsemi.com/f/nordic-q-a/20797/i-don-t-know-flow-of-ediv-randI&#39;m testing with ANCS example(SDK11.0.0), PCA10028 and Iphone, observing packet with sniffer. at the first connection, master sent EDIV( 0x0 ), Rand( 0x0 ), SKDm and IVm to slave. And slave sent SKDs and IVs. And then connection was encypted,en-USTelligent Community 13Thu, 06 Apr 2017 12:37:28 GMThttps://devzone.nordicsemi.com/thread/81226?ContentTypeID=1Thu, 06 Apr 2017 12:37:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ec74e814-1c95-49ba-918a-8060c6ecf1d8run_ar<p>Q1: The EDIV and RAND sent from the slave to the master during bonding is the EDIV and RAND the master will have to send to the slave when reconnecting to identify the LTK. Q3: Yes. Then the slave uses this to look up/identify the LTK in it&#39;s bond table.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/81225?ContentTypeID=1Tue, 28 Mar 2017 11:24:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eda3dd45-dc69-4172-9304-2ed6e6e62053J.Kwon<p>Q1 : If so.. why do EVID and Rand slave sent save in m_bond_table[]?</p> <p>Q3 : If so.. when reconnection, Does the master send back the EVID and Rand received to the slave?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/81224?ContentTypeID=1Mon, 27 Mar 2017 13:43:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3e7d60ef-e0f2-4cf2-abfb-9ed3722689ecrun_ar<p>Q1: The LL_ENC_REQUEST is sent from the master device, thus these are not relevant unless the devices switch roles in the future. Not supperted by device manager peripheral.<br /> Q2: Rand is a 64 bit number. Not to familiar with the TI sniffer...<br /> Q3. when reconnecting, the previous stored bond informatin is used. EDIV and RAND is used to identify the LTK that was exchanged in the first connection.</p><div style="clear:both;"></div>