Safety is very important on a computer network to prevent any intrusions that can lead to very serious consequences. ctunnel is a programme for securing protocols based on TCP or UDP like HTTP, Telnet, FTP, RSH, MySQL, VNC,SSH,
XDMCP and NFS. It is also possible to make connections through a proxy server and to bounce an encrypted tunnel from one host to another, whatever their number is. It also optimizes the connection to keep a good speed. Knowledge in network administration is required when using it.