In this section, the PUF is used for black key storage in the PUF boot header mode. RSA authentication is required when the PUF is used. In PUF boot header mode, the PUF helper data and the encrypted user’s AES key are stored in the boot header. This section shows how to create a BIF for using the PUF. Because the helper data and encrypted user key are unique for each and every board, the Bootgen image created only works on the board from which the helper data originated.