https://devzone.nordicsemi.com/f/nordic-q-a/15578/need-help-on-encryption-in-beacon-advertising-dataHi, I want to transmit adv. data AES encrypted everytime. The Basic requirement is to do Encryption with Stream Cipher (Counter Mode) so i want to know when and where to do encryption everytime beacon transmits new frame in the Example code ( I haveen-USTelligent Community 13Mon, 08 Aug 2016 13:30:43 GMThttps://devzone.nordicsemi.com/thread/59439?ContentTypeID=1Mon, 08 Aug 2016 13:30:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:414b880a-a8e1-42fe-948a-77952d482cd2bjorn-spockeli<p>Hi Spatel,</p> <p>I suggest that you take a look at <a href="https://devzone.nordicsemi.com/blogs/721/intro-to-application-level-security-using-the-ecb-/">this</a> blog post about using the ECB(Electronic CodeBook) peripheral to encrypt data.</p> <p>As for the where and when, you will have to encrypt the advertisment data(i.e. manuf_specific_data) before calling <code>ble_advdata_set()</code>. Everytime you want to change the the data you will have to encrypt the new data and then call <code>ble_advdata_set()</code>.</p> <p>-Bjørn</p><div style="clear:both;"></div>