Amiibo Key — Files
In strict technical terms, an “amiibo key file” (often named something like key_retail.bin or unfixed-info.bin ) is a binary file containing cryptographic keys that Nintendo uses to sign and encrypt amiibo data. These keys are the master secrets that allow the official amiibo figures and cards to be authenticated by the Nintendo Switch, Wii U, or New Nintendo 3DS.
Common tools requiring amiibo key files: amiibo key files