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Uploaded on Jan 27, 2011
Port Knocking and its big brother, Single Packet Authorization (SPA), can provide a robust additional layer of protection for services such as SSH, but there are many competing Port Knocking and SPA implementations. This talk will present practical usages of fwknop in Port Knocking and SPA modes, and discuss what works and what doesn't from a protocol perspective. Integration points for both iptables and ipfw firewalls on Linux and FreeBSD systems will be highlighted, and client-side support on Windows will be demonstrated. Finally, advanced functionality such as inbound NAT support for authenticated connections, sending SPA packets over the Tor anonymity network, and covert channel usages will be discussed. With SPA deployed, anyone scanning for a service with Nmap cannot even tell that it is listening; let alone target it with an exploit (zero-day or not).