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/