Does ZooKeeper support node-to-node encrypt communication?

Hi, All,

I want to know if the ZooKeeper supports node-to-node encrypt communication?
I read some codes of ZooKeeper 3.4.6 and found that ZooKeeper uses both UDP (e.g. in QuorumPeer.java) and TCP protocols
Is it possible to support encryption above UDP and TCP at the same time?

Thanks

Boying