I have been reading a bit about save games recently for various reasons. I know that to decrypt/encrypt save games you can use FE100 on Windows, and segher's tachtig and twintig on Linux. I also know that these tools require a number of keys extracted from your Wii. My question is: why? From my reading of this page: http://wiibrew.org/wiki/Savegame_Files, the only keys used in the encryption process is the SD-key (ab01b9d8e1622b08afbad84dbfc2a55d) and the SD-IV (216712e6aa1f689f95c5a22324dc6a98) (both found in this HackMii article: http://hackmii.com/2008/04/keys-keys-keys/) So why is it necessary to get keys from a Wii? Why are those keys not simply included in the package, seeing as it appears those are all that is necessary to decrypt or encrypt a save game? Thanks to anyone who can answer my questions, and my apologies if it is a stupid question. EDIT: OK, I'm an idiot. I did a little more reading here: http://wiibrew.org/wiki/Wii_Security and realised that a Wii's private key is needed to encrypt a save, and a few other keys (all stored in the save itself) are required to decrypt it. I'm sorry for posting this pointless topic. EDIT: OK, I have another question: Why does Tanooki not need any keys? Am I correct in my assumption that it has included in the source the SD-Key, SD IV and MD5 blanker, along with the creators Wii's private key and public keys, and when it is loading a save, it uses the SD-Key, SD-IV and MD5 blanker to find get the public keys out of the save, then when saving it, encrypts it with the creator's private key and puts his/her public keys into the save? If so, could this approach not also be taken for FE100, allowing decrypting/encrypting save games without dumping any keys from your Wii?