Why? Because these keys are proprietary data owned by Nintendo. Distributing them would be a direct violation of the Digital Millennium Copyright Act (DMCA) and international copyright laws. Emulators are legal because they are reverse-engineered clean-room software. Keys, however, are copied directly from Nintendo’s hardware.
Go to GM9Megascript -> Scripts from Plailect's Guide -> Setup Luma3DS SD card .
Nintendo uses Advanced Encryption Standard (AES) technology to protect its intellectual property on the 3DS. This encryption prevents unauthorized devices from reading game data directly from game cartridges or digital downloads (CIA files). Citra Aes Keys.txt
These are raw dumps directly from a 3DS system or cartridge. They retain Nintendo's original security layers and strictly require aes_keys.txt to boot. How to Legally Obtain AES Keys
Used for standard game data containers.
Hold the Start button while powering on your 3DS to open the Luma3DS chainloader, then select GodMode9.
The script will automatically dump your system's unique AES keys and save them to your SD card. How to Obtain the File
Think of it like a locked room: the encrypted game file is the room itself, and the "AES keys" are the keys needed to open the door. The aes_keys.txt file is simply a text document where you list all these keys in a format that Citra can understand. When Citra launches an encrypted game, it reads this file, finds the appropriate key, and uses it to decrypt the game data on-the-fly, allowing you to play.
These files have already had their cryptographic protection removed. Citra can run decrypted .3ds files immediately without requiring an aes_keys.txt file. a copyright legal battlefield
The humble aes_keys.txt file is a perfect symbol of the tension at the heart of modern emulation. It is a tiny, innocuous piece of data that represents years of reverse-engineering effort, a copyright legal battlefield, and the joy of playing beloved games on a PC.
Other keys enable advanced features like sharing Mii data via QR codes or installing encrypted system applications. How to Obtain the File