The Microchip ATECC608B series high-security cryptographic device combine world-class, hardware-based key storage with hardware cryptographic accelerators to implement various authentication and encryption protocols. It provides security enhancements over that of the ATECC608A, while providing complete backwards compatibility. All configuration settings, commands, packages and functionality of the ATECC608A are still available in the ATECC608B, making migration from the ATECC608A a simple process.

Cryptographic co-processor with secure hardware based key storage
Protected storage for up to 16 keys, certificates or data
Hardware support for asymmetric sign, verify, key agreement
ECDSA FIPS186-3 elliptic curve digital signature
NIST standard P256 elliptic curve support
Hardware support for symmetric algorithms
SHA-256 & HMAC hash including off-chip context save/restore
AES-128 Encrypt/decrypt, galois field multiply for GCM
Networking Key management support
Turnkey PRF/HKDF calculation for TLS 1.2 & 1.3
Ephemeral key generation and key agreement in SRAM
Small message encryption with keys entirely protected
Secure boot support
Full ECDSA code signature validation, optional stored digest/signature
Optional communication key disablement prior to secure boot
Encryption/Authentication for messages to prevent on-board attacks
Internal high quality NIST SP 800-90A/B/C random number generator (RNG)
Two high endurance monotonic counters