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Everything about Port knocking

Method of externally opening ports on a firewall

In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules are dynamically modified to allow the host which sent the connection attempts to connect over specific port(s). A variant called single packet authorization (SPA) exists, where only a single "knock" is needed, consisting of an encrypted packet. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Port knockingA 5-minute orientation
  2. Skim a recent paper: Rancang Bangun Keamanan Port Secure Shell (SSH) Menggunakan Metode Port KnockingInfluential work since 2022
  3. Pick up a classic book: Архипелаг ГУЛАГThe most-reprinted book on the subject
  4. Read the landmark paper: Knocking down disease: a progress report on siRNA therapeuticsCited 762 times
  5. Go sideways: Tunneling protocolA closely related topic
  6. Go sideways: SOCKSA closely related topic

📖 Definitions

Noun A means of securing ports on a firewall by requiring the host to attempt to connect to a prespecified sequence of closed ports before being allowed access to the desired port.

🗂️ The subject at a glance

  1. Overview
  2. Benefits
  3. Security considerations
  4. Disadvantages

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

🔗 Related topics