When you combine these two files into one (e.g., cat unfixed-info.bin locked-secret.bin > key_retail.bin ), you get the complete key set that most tools expect.

The master key set is universal. One key_retail.bin works for Mario, Zelda, Splatoon, and Animal Crossing figures alike. Nintendo uses the same global keys for all amiibo.

An amiibo is not just a plastic figure. Embedded in its base is an RFID (Radio-Frequency Identification) chip. This chip stores a very specific set of encrypted data. When you tap an amiibo to your Nintendo Switch’s right Joy-Con or the Wii U GamePad, the console performs a cryptographic handshake.

| File Name | Size | Purpose | | :--- | :--- | :--- | | key_retail.bin | Small | Master key file that references other encryption components; coordinates the authentication process across multiple files. | | locked-secret.bin | Small | Contains authentication data for the portion of amiibo data: this includes changing information like experience points, nicknames, and game-specific progress data. | | unfixed-info.bin | Small | Contains authentication data for the static portion of amiibo data: the permanent information like the character's identity, series, and unique identifier (UID). | | ally-all-in-839.bin | Large | A larger, comprehensive data file supporting full emulation capabilities; likely includes additional reference data that supplements the basic encryption keys. |

A streamlined iOS application designed for scanning and writing Amiibo data using an iPhone’s native NFC capabilities.

card or sticker against your phone's NFC sensor and press "Write". nfcw-shop.com Amiibo BIN Files: Your Complete Guide - Circulation