CryptHook: Secure TCP/UDP Connection Wrapper

CryptHook is a modular implementation for securing and layering cryptography for existing applications with symmetrical block cipher encryption. It works by hooking the base system calls for network communication send/sendto and recv/recvfrom. Crypthook will work with any existing application that relies on these system calls. Full example at their homepage includes tunneling SSH through the encrypted wrapper.

 http://www.chokepoint.net/2013/09/crypthook-secure-tcpudp-connection.html