saltunnel is a cryptographically secure TCP tunnel. It allows one to augment a normally-insecure TCP session with state-of-the-art security, with minimal hassle and minimal impact on performance.
For more information, see https://saltunnel.io/.
As a prerequisite, you must first have libsodium installed.
To compile and install saltunnel from source:
git clone https://github.com/notfed/saltunnel.git
cd saltunnel.git
sh autogen.sh
./configure
make
sudo make install
See https://saltunnel.io/ and saltunnel(1) for complete documentation.