Thanks for your interest in the security of ROS 2! We share your interest in this topic, and want ROS 2 security features to be available “from day one.”
In fact, as of very recently, Fast-RTPS now includes the Authentication and Encryption plugins of the DDS-Security standard:
http://docs.eprosima.com/en/latest/security.html
This version of Fast-RTPS is distributed with the Beta 2 version of ROS 2, which was released last month (June 2017).
We intend to support security features that can pass through the various adapter layers in ROS 2 and target both open-source middlewares (e.g., Fast-RTPS) as well as various proprietary middlewares (e.g., RTI Connext Secure) as our resources permit.
The work in the SROS 2 branches was merged into the “mainline” ROS 2 trees last month, just before the release of Beta 2.
Cheers!