fwknop stands for the "FireWall KNock OPerator", and implements an authorization scheme called Single Packet Authorization (SPA) ...
![[fwknop] Single Packet Authorization and Port Knocking](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjoJqCxRI57n0Cwz57n52DfXQCD7_qKPf0gvoGxYDGj3gXE5UqXSdbEHp8SZXkYEfbObbBVCLLafdT03310cGKiS13sC9HtGZPiT_RJ9mTQmN4-8ki7npPpl2T_xlmLfGwZgRixu7Y1vjg/s72-c/fwknop_tutorial_network_diagram.png)
fwknop stands for the "FireWall KNock OPerator", and implements an authorization scheme called Single Packet Authorization (SPA) ...