The CANsec Controller Core serves as a cybersecurity enhancement for controller area networks used in various applications. This core provides essential cryptographic functions for protecting messages transmitted via the CAN bus, mitigating risks associated with unauthorized data access and manipulation. Its architecture allows for seamless integration with existing CAN infrastructures, providing an upgrade path for enhancing security without overhauling legacy systems. This feature-rich core is tailored for industries where data integrity and confidentiality are paramount, ensuring robust protection of sensitive communications. Optimized for performance, the CANsec Controller Core balances high security with low latency, enhancing the reliability of secure message transmission across networked devices.