encTitleKeys.bin file is a database of encrypted title keys used by homebrew applications on the Nintendo 3DS, most notably the now-defunct
sdmc:/files3ds/enctitlekeys.bin
While you might be looking for a way to manage or restore this file, it's most commonly discussed in the context of custom firmware (CFW) What is encTitleKeys.bin? enctitlekeysbin 3ds top
Dumping keys from your own cartridges is generally considered a "gray area" for personal backups, but downloading a pre-made .bin file containing keys for games you don't own is illegal. encTitleKeys
: Because title-key-based downloading is largely broken on modern firmware, most users have moved to hShop , which provides a direct library of .cia files and its own 3DS client, bypassing the need for manual encTitleKeys.bin management. Usage (For Legacy Tools) If you are still using legacy tools that require this file: most users have moved to hShop