https://devzone.nordicsemi.com/f/nordic-q-a/22787/typical-max-aes-ccm-timeIn nRF51 PS, I read typical/max time for AES ECB are respectively 8.5 and 17&#181;s. What would be those values for the whole AES-CCM operation (ie including MIC computation), on nRF51 and nRF52? I&#39;m planning to use AES CCM with timeslot API, if I canen-USTelligent Community 13Thu, 15 Jun 2017 12:52:35 GMThttps://devzone.nordicsemi.com/thread/89599?ContentTypeID=1Thu, 15 Jun 2017 12:52:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:56dd2274-8065-4092-a6ee-ed2b95f592ffbjorn-spockeli<p>Hi Jonathan,</p> <p>we not have any public numbers for the time it takes to encrypt/decrypt + MIC calculation for n number of bytes. However, according to the AES-CCM peripheral description</p> <blockquote> <p>All operations can complete within the packet RX or TX time.</p> </blockquote> <p>This means that the worst case encrypt/decrypt + MIC calculation will be</p> <p><strong>Packet Size</strong>( overhead( address, header, preamble, CRC) + payload) / <strong>1 Mbps</strong></p> <p>You can use this to calculate the length of the timeslot.</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>