When you load a .3ds or .cia file, the emulator looks for these keys to "unlock" the game's partitions (like CTRNAND or TWLN ). : Require aes_keys.txt to function.
Unlocking the Vault: How aes_keys.txt Powers Your 3DS Emulation 3ds aeskeystxt work
: Once the file is in place, the emulator uses these keys to decrypt the game "on the fly" as it loads. Without them, you would see an error like "Your ROM is encrypted" or a failure to launch. Why It's "A Long Story" Legal Grey Area When you load a
Here’s a solid, concise technical review of how aeskeystxt works in the context of decryption, encryption, and homebrew development. and homebrew development.