The Cortex™-M3 based STM32 from STMicroelectronics includes a set of peripherals, which make applications more secure and significantly extend the chip capabilities. These include anti-tamper and flash protection features alongside advanced security features such as clock detection, lockable IOs, backup registers, dual watchdogs, power voltage supervisor, exception handling, and write once registers. In this article, we will illustrate for the first time how a Cortex-M3 based MCU with these enhanced peripherals can manage secure applications which are outside of the capabilities of a standard microcontroller.