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ATECC608B CryptoAuthentication™ Devices Microchip Technology ATECC608B CryptoAuthentication™ Devices are high-security cryptographic devices that secure hardware-based key storage of up to 16 keys. These devices feature two high-endurance monotonic counters, a unique 72-bit serial number, and an internal high-quality NIST SP 800-90A/B/C Random Number Generator (RNG).