Guests: Michael Rash, Jonathan Bennett
The main application of fwknop is 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. It implements an authorization scheme known as Single Packet Authorization (SPA) that requires only a single encrypted packet to communicate various pieces of information including desired access through a Netfilter policy and/or specific commands to execute on the target system.
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