title: Android Bluetooth Cross-Transport Key Derivation support on Android
body: <p>Is Android officially supporting CTKD? From the <a href="http://www.bluez.org/page/4/" rel="nofollow noreferrer">BlueZ documentation</a>:</p>
  <blockquote>
  <p>Another improvement that LE SC brings is what’s called cross-transport
  key derivation. What this means is that when two dual-mode (supporting
  LE + BR/EDR) devices pair with each other, they only need to pair over
  either LE or BR/EDR to get the encryption keys for both transports in
  one go.</p>
  </blockquote>
  <p>I haven't found any information in the official Android docs.</p>