Very interesting indeed. But still the size of those libraries is not compatible with the target size of the Cortex-M0, IIRC 16KB. But for the Cortex-M4 I think is a completely different story. From PolarSSL (GPLv2) https://polarssl.org/features Smaller Size -> 30K Smaller RAM -> unknown From WolfSSL (GPLv2) http://www.yassl.com/yaSSL/Products-cyassl.html Smaller Size -> 20K Smaller Ram -> 1K With Warm Regards, Ivan Raul On Fri, Feb 21, 2014 at 7:37 AM, Pekka Nikander <pekka.nikander@xxxxxx>wrote: > FYI. Related to the security design. --Pekka > > > http://www.slideshare.net/cpswan/security-protocols-in-constrained-environments > > >