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Firewall Knock Operator (fwknop)

NOTE: This project is extremely out of date.  Please do not use.  It's kept here as a place holder should I want to revisit it.

This project builds packages for the C implementation of the Firewall Knock Operator or fwknop. 
Here's a description of fwknop:

Fwknop implements an authorization scheme known as Single Packet Authorization
(SPA) for Linux systems running iptables. This mechanism requires only a
single encrypted and non-replayed packet to communicate various pieces of
information including desired access through an iptables policy. The main
application of this program is to use iptables in a default-drop stance to
protect services such as SSH with an additional layer of security in order
to make the exploitation of vulnerabilities (both 0-day and unpatched code)
much more difficult.

Look here for more info:


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