Secure 4 Click Board™ Mikroe Secure 4 Click Board™ is designed to store up to 16 keys, certificates, consumption logging, security configurations, and other types of secure data. The ATECC608A, a secure CryptoAuthentication™ device, is integrated on this click board and is equipped with an EEPROM array that stores the secure data. Mikroe Secure 4 Click Board features a cryptographic coprocessor with secure hardware-based key storage and hardware support for asymmetric sign, verify, and key agreement.