The SECURE UDFN CLICK with Click board manufactured by MikroElektronika is an authentication module designed for use with MikroElektronika’s range of mikroBUS Click board products. The module is based on the 08QN50L43020 chip from STMicroelectronics and provides user authentication security across four interfaces: GPIO, I2C, SPI, and SWI. The 08QN50L43020 allows for authentication at three levels of security across the four interfaces, using the AES128 encryption algorithm. This provides a robust security layer on the device, protecting it against malicious attempts to access data or control its functionality. The module is fitted with two LEDs, one for status indication and one for communication control. In addition to authentication, the module provides a range of features for access control and power management. It supports a ‘Secure Boot’ feature, whereby the application software is securely loaded into the device during initialization, protected against malicious alteration or tampering. The module also offers ‘Access Control’, whereby user authentication is, again, secured by the AES128 encryption algorithm and the device is protected against unauthorised access attempts. Finally, the module features two power-saving modes: deep sleep and power-down sleep, both of which allow the device to remain dormant when not in use. Overall, the SECURE UDFN CLICK with Click board manufactured by MikroElektronika is an ideal solution for anyone looking to secure their application software, access control, and power management device. The AES128 encryption algorithm ensures that the device is securely protected against unauthorised attempts to access it, while the deep sleep and power-down sleep modes allow the device to remain dormant when not in use.