Hi Does anyone fancy extending the work I’ve done so far, possibly doing a mix-n-match with Tiny-AES128-C, to get to what I think should be an achievable ~4kB code size on Arduino/ATMega328P and ending up with something with an Apache (or even more liberal) licence? http://www.earth.org.uk/note-on-IoT-security.html#app4 Rgds Damon