Citra requires a valid aes_keys.txt file placed in the folder of its user directory to decrypt and run encrypted 3DS games
kdumper: This homebrew application extracts the precise keys directly from your 3DS's ARM11 processor.: Some "high-quality" key dumps also include keys for system-level features like StreetPass and shared data, which can enhance the overall emulation depth. User Perspective and Challenges citra aes keystxt high quality
A complete, high-quality aes_keys.txt ensures that 100% of encrypted .3ds or .cia files will boot without crashing. Citra requires a valid aes_keys