Single Packet Authorization: Next Generation Port Knocking

There has been a lot of buzz surrounding the concept of Port Knocking, but a new player is on the scene called “Single Packet Authorization”. SPA has the benefits of Port Knocking (i.e. service protection behind a default-drop packet filter), but solves all of its limitations. SPA packets are non-replayable, are even compatible with GnuPG keys.

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