In the past, users would scour the internet looking for a pre-made enctitlekeys.bin file to download. Downloading key databases from random websites can be risky (potential for malware) and is often legally grey.
When a user inserts a game cartridge or downloads a game from the Nintendo eShop, the 3DS console checks the game's title key against the ones stored in the enctitlekeysbin file. If a matching key is found, the game is decrypted and can be played on the console. This process ensures that only legitimate copies of games can be played, preventing piracy and unauthorized access. enctitlekeysbin 3ds top
Nintendo can track application usage via the console's Activity Log , which syncs with their servers. While bans are rare for simply having homebrew, using these keys to access the eShop illegally carries risks. In the past, users would scour the internet