ROM Hack Does anyone know how to decrypt CIA files?

[cearp]

So then is there anyway to decrypt them? I'd imagine it'd be just like decrypting a 3ds rom, but I thought if I couldn't decrypt it in cia form, I could convert it into a 3ds format and decrypt it like a game...

you need to find the key, in the cia/ticket, then decrypt that to get the decryption key - then you can use aescbc to decrypt it

The .csu versions of the dev tools from the BigBlueBox pack are all already decrypted, and .csu virtually identical to .cci/.3ds, just with a different file extension. You can extract their contents without any decryption process needed.

i thought they couldn't install... really? hmm