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The PortKnocko project is composed of two parts: an iptables module (user space) and a netfilter module (kernel space). Both modules are used to implement the Port Knocking and SPA (Simple Packet Authentication).
pblogan (Phone Box LOG ANalyzer)
A set of perl scripts that extract information from a Panasonic Phone Box via serialport, and upload them to a Postgres Database which is queried by several php pages.