To use encrypted 3DS games on Citra or its successors like Lime3DS, you need a specific file named aes_keys.txt placed in the emulator's system data folder. This file contains the cryptographic keys needed to decrypt and run game data. 1. Obtain the aes_keys.txt File You can get these keys in two ways:
Legally (Recommended): Use a modded 3DS with GodMode9 to dump your system's unique keys directly to a file.
Manual Creation: Some users find the key text online (e.g., from GitHub or Pastebin) and manually paste the contents into a new text file named exactly aes_keys.txt. 2. Locate the Correct Folder
The aes_keys.txt must be placed in a subfolder named sysdata within your Citra User Directory. If the sysdata folder doesn't exist, you must create it manually. Typical Path to sysdata Windows C:\Users\[Username]\AppData\Roaming\Citra\sysdata Android
Internal Storage/citra-emu/sysdata (or emulation/Lime 3DS/cyst data) macOS ~/Library/Application Support/Citra/sysdata Linux ~/.local/share/citra-emu/sysdata 3. Installation Steps
Open the Folder: In the Citra desktop app, go to File > Open Citra Folder to reach the root directory quickly.
Create/Open sysdata: Look for the sysdata folder. If it's missing, create a new folder and name it sysdata. Place the File: Move your aes_keys.txt into this folder. citra aes keystxt updated
Restart Citra: Close and reopen the emulator for the changes to take effect. Alternative: Use Decrypted ROMs
To use Citra with encrypted games, you need to provide the emulator with the correct AES keys (stored in a file called aes_keys.txt). These keys are used to decrypt game data so the emulator can run the software. Where to Place aes_keys.txt
Depending on your device, the file must be placed in a specific folder within Citra's user directory:
Windows: C:\Users\ Android: Internal memory/citra-emu/sysdata macOS: ~/Library/Application Support/Citra/sysdata
Linux/Steam Deck: ~/.var/app/org.citra_emu.citra/data/citra-emu/sysdata (folder path may vary depending on installation method) How to Get the Keys
According to the official 3DS Emulation Guide, the only legal way to obtain these keys is to dump them directly from your own Nintendo 3DS hardware: To use encrypted 3DS games on Citra or
Preparation: Ensure your 3DS is running a custom firmware (CFW) like Luma3DS and has GodMode9 installed.
Script: Download the dumpkeys.gm9 script and place it in the /gm9/scripts/ folder on your SD card.
Execution: Launch GodMode9 on your 3DS, press the Home button, select Scripts, and run DumpKeys.
Transfer: Once finished, you will find aes_keys.txt in the /gm9/ folder on your SD card. Copy this file to the sysdata folder in your Citra directory. Troubleshooting
Missing sysdata Folder: If you do not see a sysdata folder, you can simply create a new folder with that name manually.
Decryption Errors: If Citra still fails to load your games, your aes_keys.txt may be outdated or missing specific keys for your game version. Copyright: The AES keys are copyrighted code owned
Alternative: You can bypass the need for AES keys by using decrypted ROMs (usually in .3ds or .cia format), which do not require external key files to run in Citra.
Slot0x15KeyY = XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
aes_keys.txt in the Citra Emulation EnvironmentAbstract
This paper explores the role, structure, and functionality of the aes_keys.txt file within the Citra Nintendo 3DS emulator. It examines the cryptographic implementation of the AES-128-CTR algorithm utilized by the 3DS hardware, the necessity of key extraction for emulation, and the transition from user-managed key files to automatic key derivation in modern emulation builds.
It is important to note the legality of these keys.
aes_keys.txt online is generally considered a violation of copyright law (and DMCA rules). This is why legitimate emulator sites do not host these files directly; they require users to dump them from their own 3DS consoles using custom firmware (CFW) and tools like boot9strap and DumpKeys.Warning: Be very careful downloading "updated" aes_keys.txt files from random internet forums or YouTube video links. It is a common vector for malware. Since the official Citra site is down, malicious actors often disguise executables as "Citra Key Updaters."