The Maxim Integrated DS28E40 is a secure authenticator that provides a core set of cryptographic tools derived from integrated asymmetric (ECC-P256) and symmetric (SHA-256) security functions. It has one GPIO pin with optional authentication control
It has optional chip-generated Pr/Pu key pairs for ECC operations
It offers 6Kb of one-time programmable (OTP) for user data, keys, and certificates
It has unique and unalterable factory-programmed 64-Bit identification number (ROM ID)
It has single-contact, 1-wire interface communication with host at 9.09kbps and 62.5kbps