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How do cipher keys work?

Attach ciphers to a Normal module, then apply the key.

You'll need

  • a Normal module of the key's type, its
  • ciphersand the Cipher Key
  1. Pick one with exactly the key's number of ports, identified, not Faction quality. Easiest: craft it from a researched blueprint.
  2. Attach the ciphers to its ports. Each adds the cell its port points at to the shape, and can't currently be removed.
  3. Apply the key. The module becomes a harmonic.

Good to know

  • All known keys use two ciphers, so the module needs exactly two ports.
  • A cipher that makes a fitted module too big to fit is refused, not used up.
  • Ciphers landing on random ports is a bug being fixed: you should get to pick.
  • Wrong module type? A developer suggests changing it with a Thoth adapter, then applying the key.

Warning

A harmonic adds 1,000 to its build rating.

Dev-confirmedBeta 1 (wipe 1)Sign in to report as outdated
Discuss in the forum
Sources (17)
SpeakerTierSaid on
phyzixteacherDeveloper2 Oct 2026
phyzixteacherDeveloper2 Oct 2026
Not namedTrusted player1 Oct 2026
phyzixteacherDeveloper2 Oct 2026
0xheimdallDeveloper4 Oct 2026
phyzixteacherDeveloper3 Oct 2026
Not namedPlayer3 Oct 2026

Paraphrased from the Citadel Discord. Developers and official documents are named; other players by trust tier. Last verified 4 Oct 2026 for Beta 1 (wipe 1).

Also drawn from

  • Citadel Wiki: Tek Ciphers: The module's type must be the one the harmonic recipe names
  • Citadel Wiki: Tek Ciphers: The module must be identified and not Faction quality
  • Citadel Wiki: Tek Ciphers: Each attached cipher grows the module by the cell its port points at
  • Citadel Wiki: Tek Ciphers: Using a Cipher Key on the module makes it a Harmonic
  • Citadel Wiki: Tek Ciphers: Every recipe uses two ciphers, so the module needs exactly two ports
  • Citadel Wiki: Tek Ciphers: On a fitted module, a cipher that makes the shape illegal is refused and not used up
  • Citadel Wiki: Build rating: A harmonic adds 1,000 to the rating
  • Discord: developer answer, 4 Oct 2026: Ciphers can't currently be removed; workaround: change the module's type with a Thoth adapter, then apply the cipher key
  • Discord: developer answer, 3 Oct 2026: You should be able to choose which port each cipher goes on; ciphers landing on random ports is a bug being fixed; the module needs exactly as many ports as the recipe's ciphers
  • Discord: player, 3 Oct 2026: Ciphers are permanent once attached

Collected from the Citadel Discord and added on 3 Oct 2026.