STMicroelectronics has expanded its portfolio of STSAFE secure elements with the launch of a new product, the STSAFE-A1SX, designed to work with the Sigfox low-power wide-area network (LPWAN).

Based on a tamper-resistant Common Criteria EAL5+-certified technology, STSAFE-A1SX connects to the microcontroller of the IoT application or module via an Intelligent Interface Controller (I2C) connection. The chips are provisioned in ST’s secure-personalisation centre with device ID and keys that allow plug-and-play secure connection to the Sigfox cloud, and further ensure data-exchange integrity and confidentiality. Whether the frame is an uplink or downlink message, the STSAFE-A1SX secure element generates or verifies payload proof of integrity as well as optional encryption or decryption. Keys and other secrets are always protected inside the secure element during manufacturing and over the end device’s full life.

“By executing Sigfox security services within our certified tamper-proof STSAFE-A1SX, we support Sigfox Ready device makers and Sigfox application providers to implement state-of-the-art end-to-end security,” said Laurent Degauque, Secure Microcontroller Marketing Director, Microcontroller and Digital ICs Group, STMicroelectronics. “The STSAFE-A1SX makes security over the Sigfox network even stronger and more straightforward. Our customers simply attach this secure element to their general-purpose MCU, such as an STM32, and focus on application development.”

Like other members of the STSAFE family, the STSAFE-A1SX will come with a full ecosystem of tools and software, according to the company. The device is available on expansion boards directly compliant with the STM32 Open Development Environment. Associated with the ST S2-LP sub-1GHz transceiver and the STM32, ST provides a complete reference design of a Sigfox Ready device.

The STSAFE-A1SX secure element is scheduled to enter production in May 2017 in both 4mm x 5mm SO8N and 2mm x 3mm UFDFPN8.