SniffJoke is an application for Linux that handle transparently your TCP connection. It delays, modify and inject fake packets inside your transmission, making them almost impossible to be correctly read by a passive wiretapping technology (IDS or sniffer) An Internet client running Sniffjoke injects in the transmission flow some packets able to seriously disturb passive analysis like sniffing, interception and low level information theft. No server support is needed! The application uses the network protocol in a permitted way, exploiting the difference of network stack present in an operating system respect the sniffers.
Source: https://thehackernews.com/2011/05/sniffjoke-041-anti-sniffing-framework.html