The project uses pyzmq for it's network communication components. It sends objects using the build in pickle module. Without proper security on the network components attackers could potentially execute any python code on a victims system, therefore keys are required to secure the communication.
Simply run generate_certificates.py to generate a new set of keys.
Copy the private_keys and public_keys onto all systems participating
in the training.
The script for generating the keys and other information can be found here: https://github.com/zeromq/pyzmq/tree/master/examples/security