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Table of Contents

FWKNOP

Single Packet Authorization (SPA) Port Knocking.

Port knocking is used to alter packet filter rules on a host dependant upon a secret packet delivered to that host.

It can be used to open a port to an SSH server from a single host. This opening will occur for a limited time period to allow authentication. After a fixed duration. the port is then closed to world as it was originally.

Resources

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