This key is responsible for signing and encrypting "unfixed" or "unlocked" information. This includes data that changes during gameplay, such as the amiibo's nickname, the owner’s Mii, and character progress (e.g., Smash Bros. training levels or Wolf Link’s heart count).
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Amiibo data is split into two distinct parts, each requiring its own specific key for access: This key is responsible for signing and encrypting
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Used to encrypt and sign "unfixed" or rewritable data, including the amiibo's nickname, owner information, and game-specific progress (e.g., Smash Bros. fighter levels). How the Keys Work Nintendo uses HMAC-SHA256 for digital signing and in counter mode for data encryption. Unique Derivation:
Most software requires two specific files, though they are often found combined as a single file: locked-secret.bin : Used to decrypt the rewritable data on an Amiibo. unfixed-info.bin : Contains static information about the character. key_retail.bin