Package tcpcrypt

Opportunistically encrypt TCP connections

http://tcpcrypt.org/

Provides a protocol that attempts to encrypt (almost) all of your
network traffic. Unlike other security mechanisms, Tcpcrypt works out
of the box: it requires no configuration, no changes to applications,
and your network connections will continue to work even if the remote
end does not support

System Administration
Command Description
tcnetstat Print information about network connections protected by tcpcrypt
tcpcryptd Implement the tcpcrypt protocol by transparently modifying network I/O