All gamecard and SD savegames are encrypted with AES-CTR. The gamecard savegame [[AES|keyslot]] keyY is unique for every region of each game. A flag stored in the [[NCSD]] determines the method used to generate this keyY. This same flag is also used for determining which CTR period is used as well. The keyY when the flag is clear is generated from data stored in the main [[NCCH#CXI|CXI]], and data retrieved from gamecard commands. When the flag is set, a hash is generated for the keyY over the data from the CXI, and an ID retrieved from a gamecard command. The base CTR for gamecard savegames is all-zero. SD savegames use a CTR where the base CTR is fixed per savegame, however the CTR doesn't repeat in the image. | All gamecard and SD savegames are encrypted with AES-CTR. The gamecard savegame [[AES|keyslot]] keyY is unique for every region of each game. A flag stored in the [[NCSD]] determines the method used to generate this keyY. This same flag is also used for determining which CTR period is used as well. The keyY when the flag is clear is generated from data stored in the main [[NCCH#CXI|CXI]], and data retrieved from gamecard commands. When the flag is set, a hash is generated for the keyY over the data from the CXI, and an ID retrieved from a gamecard command. The base CTR for gamecard savegames is all-zero. SD savegames use a CTR where the base CTR is fixed per savegame, however the CTR doesn't repeat in the image. |