is a database file containing encrypted cryptographic keys used by the Nintendo 3DS console to validate, decrypt, and install software. In the 3DS homebrew and emulation scene, this specific file historically allowed homebrew software like freeShop and CIAngel to fetch game packages directly from Nintendo’s Content Delivery Network (CDN).

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Certain highly encrypted .CIA files cannot run on the Citra emulator out of the box. Users must supply an encryption database keys file to Citra's system folder so the emulator can decode game assets on the fly.