CryptCat is a simple Unix utility which reads and writes data across network connections, using TCP or UDP protocol while encrypting the data being transmitted. It is designed to be a reliable “back-end” tool that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities.
Cryptcat – is a lightweight version of netcat extended with twofish encryption.

root@kali:~# cryptcat -h
[v1.10]
connect to somewhere:   nc [-options] hostname port[s] [ports] ...
listen for inbound: nc -l -p port [-options] [hostname] [port]
options:
    -g gateway      source-routing hop point[s], up to 8
    -G num          source-routing pointer: 4, 8, 12, ...
    -h          this cruft
    -i secs         delay interval for lines sent, ports scanned
    -l          listen mode, for inbound connects
    -n          numeric-only IP addresses, no DNS
    -o file         hex dump of traffic
    -p port         local port number
    -r          randomize local and remote ports
    -s addr         local source address
    -u          UDP mode
    -v          verbose [use twice to be more verbose]
    -w secs         timeout for connects and final net reads
    -z          zero-I/O mode [used for scanning]
port numbers can be individual or ranges: lo-hi [inclusive]

 
 
Cryptcat usage:
On the server, listen for a connection (-l) on port 4444 (-p 4444) and don’t do name resolution (-n). Redirect all data to a file (> dataxfer). On the client, connect to the remote IP address (192.168.1.202) on port 4444 (4444) and pipe in the data to be transferred (< /tmp/juicyinfo):
 

root@kali:~# cryptcat -l -p 4444 -n > dataxfer
root@kali:~# cryptcat 192.168.1.202 4444 < /tmp/juicyinfo

 
Source: http://cryptcat.sourceforge.net/