History of Network Key

The Network Key is a consumable item, originally from Destiny, whose description calls it a "one-time code used to secure Cabal communications." Cabal units drop it at random.

Acquisition

• Drops: Randomly from Cabal enemies.
• Cryptarch: A Cryptarch pays 200 Glimmer per key. With Resupply Codes active, Glimmer gains rise by 7.5%, a net of 215 Glimmer per key.
• Reef Cryptarchy: The Reef Cryptarchy at 10 Hygiea also buys Network Keys.

See Axiomatic Bead, House Banner and Silken Codex for the other items Cryptarchs buy at the same price.