Encryption on Node to Node Communication CB5.5


In one of my work related project we are using CB 5.5 and trying to install CB cluster on AWS. One of the requirement is we cannot use unencrypted port for node to node communication .
For Cb5.5 I do not find any Encyrpted ports listed.

Node-to-node: Between all nodes within a single cluster.
4369, 8091-8096, 9100-9105, 9110-9118, 9120-9122, 9999, 11209, 11210, 21100-21299

Is there any alternative for this to encrypt the ports, as of now upgrade to new version of CB is not available also.

Please help!!!